CN1050147C - Anti-forgery penetrant atomic stamp pad ink and its prepn - Google Patents
Anti-forgery penetrant atomic stamp pad ink and its prepn Download PDFInfo
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- CN1050147C CN1050147C CN96104762A CN96104762A CN1050147C CN 1050147 C CN1050147 C CN 1050147C CN 96104762 A CN96104762 A CN 96104762A CN 96104762 A CN96104762 A CN 96104762A CN 1050147 C CN1050147 C CN 1050147C
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- oil
- ion
- ink
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Abstract
The present invention relates to permeability type atomic print ink and a preparation method thereof. Fluorescent anti-counterfeiting permeability type atomic print ink is prepared by adding organic pigment in metal ion fluorescent coordination compounds, preparing coloring materials by adding a binding agent, and mixing and grinding by adding a diluting agent and an auxiliary agent. The permeability type atomic print ink can be used for atomic signets, ink paste and ink pads, the anti-counterfeiting performance is reliable, and the detection is easy.
Description
The present invention relates to a kind of printing-ink, more specifically saying so relates to a kind of fluorescence falsification preventing atomic seal ink that is applicable to osmosis type atom seal, ink pad and ink paste and preparation method thereof.
Falsification of public seal carries out criminal activity and is seriously endangering country and the Economic development of enterprise and people's orthobiosis.No matter facts have proved, be that hand engraves a seal, or the atom print of machine making, and its seal is all than being easier to by imitated.Therefore, list is existing outside seal differentiates that the true and false difficulty of seal is very big.So preventing the method for falsification of public seal mainly is to adopt the stamp-pad ink (comprising ink paste) with anti-counterfeiting performance.Anti-counterfeiting stamp ink must satisfy such three conditions: the one, and the manufacture craft difficulty is big, and difficult quilt maybe can not the person of being forged prepare; The 2nd, stable performance, good reliability; The 3rd, detection means is accurate, reversible, convenient.To the research of anti-counterfeiting stamp ink, the report of seeing at present also seldom both at home and abroad.JP56115288 has introduced a kind of ink paste of making of temperature reversible color material, and the seal that utilizes this ink paste to cover out is met thermo-color, arrives false proof purpose with this this.The detection means inconvenience of this thermal seal, reliability relatively poor (specific discoloring temperature value can not be arranged).In addition, because ink paste or ink pad and seal are separated, in a single day ink pad or ink paste are lost, and will cause trouble.
It is big to the purpose of this invention is to provide a kind of manufacture craft difficulty, good reliability (being that anti-counterfeiting performance is strong), detection means is easy, the display effect distinctness be used for fluorescence falsification preventing permeability type atomic seal ink of osmosis type atom seal, ink pad and ink paste and preparation method thereof.
The object of the present invention is achieved like this.The present invention adds or does not add organic pigment (a2) by the metal-ion fluorescent title complex (a1) that colorant (A)=metal ion and organic compound form to add resin type low-melting ink vehicle (a3), and thinner (B)=mineral oils and/or plant oil and/or organosilane ester and/or organic acid and/or organic alcohols, and the fluorescence falsification preventing permeability type atomic seal ink of auxiliary agent (C)=anti-siccative class and/or surfactant-based material composition.The composition weight ratio of its each component is A: B: C=1: 1～4: 0.01～1, and a1: a2: a3=1: 0～2: 2～5.
When a2＞0 (preferably a2=0.5～2), the stamp-pad ink of being formed is the fluorescence falsification preventing permeability type atomic seal ink of showing one's color, and promptly the seal that covers out with this stamp-pad ink is coloured showing one's color; When a2=0, the stamp-pad ink of being formed is the concealed fluorescent anti-forgery penetrant atomic stamp pad ink, and promptly the seal that covers out with this stamp-pad ink is colourless cryptomorphic.
A1 is by Al
3+, Be
2+, Ga
3+, Sc
3+, In
3+, Th
4+, Zr
4+Or Zn
2+With contain
The metal-ion fluorescent title complex that the hydroxyanthraquinone dyestuff of structure or azoic dyestuff form, or by Ga
3+With contain
The metal-ion fluorescent title complex that the dyestuff of structure forms, or by Mg
2+, Al
3+, In
3+, Ga
3+, Zn
2+, Be
2+Or Co
2+With contain
The metal-ion fluorescent title complex that the dyestuff of structure forms, or the metal-ion fluorescent title complex that forms by europium ion, samarium ion or terbium ion and naphthalene acetyl trifluoroacetone, EDTA, hexafluoroacetylacetone, thiophene acetyl trifluoroacetone, triphenylphosphine oxide, trioctyl phosphine oxide, vulkacit D, tributyl phosphate, trioctyl phosphate, o-phenanthroline or sulphosalicylic acid.
A2 selects red pigment for use, as bronze red, red, permanent bordeaux, everbright fast red, rubber is bright red or oil red; Or select blue pigments for use, as peacock blue, pake purpke, phthalocyanine blue or light blue; Or select veridian for use, as phthalocyanine green; Or select yellow ultramarine for use, as permanent yellow or Oil Yellow; Or select black pigment for use, as nigrosine or carbon black.
A3 selects a kind of in plant oil modified Synolac, rosin modified phenolic resin, rubber resin, Resins, epoxy, the polyamide resin or two kinds for use.
B selects at least a in high-boiling point kerosene, machine oil, pump oil, sunflower seed oil, soya-bean oil, peanut oil, Viscotrol C, phthalic ester, terephthalate, fatty group dibasic acid, polyol ester, benzene polyacid ester, acetate, caproic acid, oleic acid, stearic acid, ethylene glycol, glycerol, lauryl alcohol, hexadecanol, the stearyl alcohol for use.
C selects at least a in phenolic antioxidant, amine antioxidants, fatty acid quaternary ammonium salt class, soap class, alkylphenol polyoxyethylene, the carboxylicesters for use.
The preparation of fluorescence falsification preventing permeability type atomic seal ink of the present invention can be selected any one in the following method.
Method one:
1. a1 or a1 are added a2, mix by desired ratio of components weight with a3 and make colorant A.
2. the B and the C that in A, add the ratio of components weight that requires.
3. with mixing kettle or colloidal mill above-mentioned A being added B, to add the C thorough mixing even, is ground to less than 15 μ with three-roller or sand mill or ball mill or colloidal mill again, promptly makes the fluorescence falsification preventing permeability type atomic seal ink.
Method two:
1. a1 or a1 are added a2, mix by desired ratio of components weight, make colorant A with a3.
2. in A, add the B and the C of the part in the ratio of components weight that requires, with mixing kettle or colloidal mill that this mixture thorough mixing is even, be ground to less than 15 μ with three-roller or sand mill or ball mill or colloidal mill again.
3. B and the C with remainder in the requirement ratio of components weight joins in the prepared mixture of 2 steps, and be even with mixing kettle or colloidal mill thorough mixing, promptly makes the fluorescence falsification preventing permeability type atomic seal ink.
Method three:
1. a1 or a1 are added a2, mix by desired ratio of components weight, make colorant A with a3.
2. with three-roller, sand mill, ball mill or colloidal mill A is ground to less than 15 μ.
3. in the A that ground, add the B and the C of the ratio of components weight that requires, even with mixing kettle or colloidal mill thorough mixing, promptly make the fluorescence falsification preventing permeability type atomic seal ink.
The advantage that the present invention compared with prior art has is: fluorescent substance comprises inorganic high-visibility pigment, organic fluorescent pigment and metal-ion fluorescent title complex.Wherein, the fineness after inorganic high-visibility pigment grinds in permeability type atomic seal ink is difficult to reach about 10 μ, and sedimentation easily; Organic fluorescent pigment belongs to pigment with day-light fluorescence.Both obtain again easily (refer to tamperer oneself prepare or buy from market).Therefore, both all cannot be used for having the atomic seal ink of anti-counterfeiting performance.Through prolonged and repeated experimental study.The present invention adopts the metal-ion fluorescent title complex.Though the preparation method of metal-ion fluorescent title complex had report on many documents, but because the complex structure of this title complex, preparation technology's difficulty is very big, the synthetic voluntarily possibility for preparing of tamperer is minimum, and (the one, difficulty is big, the 2nd, uneconomical economically), and can directly buy nowhere on the market.Therefore, the metal-ion fluorescent title complex is difficult to obtain, and the manufacture craft of adding permeability type atomic seal ink itself requires height, and difficulty is also big, and this has just just in time satisfied first condition as anti-counterfeiting stamp ink.Fluorescence falsification preventing permeability type atomic seal ink of the present invention is identical with the physicals of existing general permeability type atomic seal ink, and viscosity is less than 1000cp/25 ℃, and fineness is less than 15 μ, thereby long storage can layering, good stability.Because of every kind of fluorescence complex all has own specific emission wavelength, this has just guaranteed false proof reliability.The present invention has the show one's color prescription of atomic seal ink and stealthy atomic seal ink of shades of colour in addition, make the appearance color of seal and hidden fluorescence color change various, this has improved false proof unfailing performance of the present invention again greatly, and this has just satisfied second condition as anti-counterfeiting stamp ink.The seal that covers out with stamp-pad ink of the present invention just shows distinct specific fluorescence color and pattern under the ultra-violet lamp irradiation that general currency examine is used, detection means is simple, divides evident easy.This has just satisfied the 3rd condition as anti-counterfeiting stamp ink.One is inseparable each other for seal Zhang Mo and fluorescence falsification preventing permeability type atomic seal ink of the present invention in addition, has increased the security in using.Stamp-pad ink of the present invention is also applicable to anti-counterfeiting stamp pad and anti-fake inkpad.
Embodiment 1:
Take by weighing following prescription (weight ratio): A=[a1=Ga
3+The title complex (1 part) that ion and rhodamine B form] and [a3=soya-bean oil modified alkyd resin-long-oil-length (3 parts)], B=Octyl adipate (8 parts), C=OP-7 (0.1 part) and Resorcinol (0.05 part).A1 and a3 are mixed back adding B and C, and after mixing with mixing kettle, being ground to fineness with colloidal mill again is 10 μ.(stealth) seal that the concealed fluorescent anti-forgery penetrant atomic stamp pad ink that makes thus covers out shows yellow-green fluorescence under uviolizing.
Embodiment 2:
Take by weighing following prescription (weight ratio): A=[a1=Eu
3+The title complex (1 part) that ion and hexafluoroacetylacetone and triphenylphosphine oxide form] and [the castor oil modified Synolac-long-oil-length of a3=(4 parts)], B=Viscotrol C (7.5 parts), C=tween-80 (0.05 part) and antioxidant A P (0.05 part).A1 and a3 are mixed back 3.5 parts of B of adding and 0.05 part of C, after mixing with colloidal mill, be ground to fineness less than 15 μ, add remaining 4 parts of B and 0.05 part of C again, mix with colloidal mill with three-roller.The stealthy seal that the concealed fluorescent anti-forgery penetrant atomic stamp pad ink that makes thus covers out shows red fluorescence under uv irradiating.
Embodiment 3:
Take by weighing following prescription (weight ratio): A=[a1=Al
3+Title complex (1 part) with the formation of fluorescence gallium] and [a2=Oil Yellow (1 part)] and [a3=rosin modified phenolic resin (3 parts)], B=machine oil (20 parts), C=OP-10 (0.2 part) and antioxidant DOD (0.05 part), a1 and a2 and a3 are mixed, with ball mill grinding to fineness less than 15 μ, add B and C again, even with the mixing kettle thorough mixing.The seal that the fluorescence falsification preventing permeability type atomic seal ink that makes thus covers out shows yellow fluorescence for yellow under uviolizing.
Embodiment 4:
Take by weighing following prescription (weight ratio): A=[a1=Sm
3+The title complex (1 part) that ion and 2-naphthalene-trifluoroacetone forms] and [a2=phthalocyanine blue (1.5 parts)] and [the castor oil modified Synolac of a3=(3.5 parts)], B=terephthalic acid didecyl ester (18 parts), C=sodium laurylsulfate (0.1 part).The preparation method is with embodiment 3.The seal that the fluorescence falsification preventing permeability type atomic seal ink that makes is thus impressed out shows red fluorescence for blue under uviolizing.
Embodiment 5:
Take by weighing following prescription (weight): A=[a1=Sc
3+Title complex (1 part) with oxine formation] and [a3=alcohol soluble polyamide (4 parts)], B=phenylcarbinol (15 parts) and dimethyl phthalate (5 parts), C=sterol (0.1 part) and distearyl acid quadrol (0.1 part).The preparation method is with embodiment 1.The stealthy seal that the concealed fluorescent anti-forgery penetrant atomic stamp pad ink that makes thus covers out shows yellow fluorescence under UV-irradiation.
Embodiment 6
Take by weighing following prescription (weight ratio): A=[a1=Tb
3+Title complex (1 part) with naphthalene acetyl trifluoroacetone and tributyl phosphate formation] and [a2=bronze red (1.5 parts)] and [a3=rubber resin (3.5 parts)], the B=ink oil, boiling range 250-290 ℃ (12 parts) and dioctyl phthalate (DOP) (12 parts), C=Syzygium aromaticum stem oil (0.12 part) and triphenyl phosphite (0.12 part).The preparation method is with embodiment 2.The seal that the fluorescence falsification preventing permeability type atomic seal ink that makes thus covers out manifests red fluorescence for red under uviolizing.
Embodiment 7:
Take by weighing following prescription (weight ratio): A=[a1=Sm
3+Title complex (1 part) with thiophene acetyl trifluoroacetone and vulkacit D formation] and [a2=nigrosine (0.8 part)] and [a3=Synolac-oil content is 70 (4 parts)], B=machinery oil-20 (14.5 parts) and oleic acid (5.8 parts), C=polyethylene wax (2.9 parts) and butanols (0.058 part) and dodecyl dimethyl amine salt (0.116 part).A1 and a2 and a3 are mixed the back, and to be ground to fineness with three-roller be 15 μ, adds B and C again, mixes with mixing kettle, and being ground to thin skin with sand mill again is 10 μ.The seal that the fluorescence falsification preventing permeability type atomic seal ink that makes thus covers out is a black, shows red fluorescence under uviolizing.
Embodiment 8:
Take by weighing following prescription (weight ratio): A=[a1=Ga
3+Title complex (1 part) with dihydroxyanthraquinone formation] and [a2=rosin modified phenolic resin (3.5 parts)], the B=ink oil, boiling range 250～290 ℃ of (16.5 parts) and glyceryl stearate (5.5 parts), C=Sorbitol Powder trioleate (0.055 part) and p-aminophenol (0.11 part).The preparation method is with embodiment 2.The seal that the fluorescence falsification preventing permeability type atomic seal ink that makes thus covers out shows green fluorescence for red under uviolizing.
Embodiment 9:
Take by weighing following prescription (weight ratio): A=[a1=In
3+The title complex (1 part) that ion and 7 iodo 8 hydroxyquinoline 5 sulfonic acid ferr form] and [a2=pigment Blue 15 (0.9 part)] and No. 4, a3=stand oil No. 3 (2.0 parts) and stand oil [(2.5 parts)], the B=ink oil, boiling range 250-290 ℃ (12.8 parts) and trioctyl phosphate (9.6 parts) and butyl oleate (3.2 parts), C=oxidation inhibitor T-501 (0.32 part) and dodecylbenzene phenol polyethenoxy ether (0.192 part).The preparation method is with embodiment 7.The seal that the fluorescence falsification preventing permeability type atomic seal ink that makes thus covers out shows yellow fluorescence for blue under uviolizing.
Claims (8)
1, a kind of anti-forgery penetrant atomic stamp pad ink, form by colorant, dilution material and auxiliary agent, it is characterized in that: its colorant is followed successively by 1: 0～2: 2～5 metal-ion fluorescent title complex and pigment dyestuff and resin type and links agent and mix and make by forming weight ratio, and wherein the metal-ion fluorescent title complex is by Al
3+, Be
2+, Ga
3+, Sc
3+, In
3+, Th
4+, Zr
4+Or Zn
2+With contain
The metal-ion fluorescent title complex that the hydroxyanthraquinone dyestuff of structure or azoic dyestuff form, or by Ga
2+With contain
The metal-ion fluorescent title complex that the dyestuff of structure forms, or by Mg
2+, Al
3+, In
3+, Ga
3+, Zn
2+, Be
2+Or Co
2+With contain
The metal-ion fluorescent title complex that the dyestuff of structure forms, or the metal-ion fluorescent title complex that forms by europium ion, samarium ion or terbium ion and naphthalene acetyl trifluoroacetone, EDTA, hexafluoroacetylacetone, thiophene acetyl trifluoroacetone, triphenylphosphine oxide, trioctyl phosphine oxide, vulkacit D, tributyl phosphate, trioctyl phosphate, o-phenanthroline or sulphosalicylic acid; The red pigment that pigment dyestuff is selected for use is bronze red, red, permanent bordeaux, everbright fast red, rubber is bright red or oil red, or the blue pigments of selecting for use is peacock blue, pake purpke, phthalocyanine blue or light blue, or the veridian of selecting for use is a phthalocyanine green, or the yellow ultramarine of selecting for use is permanent yellow or Oil Yellow, or the black pigment of selecting for use is nigrosine or carbon black; Resin type links agent and selects a kind of in plant oil modified Synolac, rosin modified phenolic resin, rubber resin, the polyamide resin or two kinds for use; Dilution material is selected at least a in high-boiling point kerosene, machine oil, pump oil, sunflower seed oil, soya-bean oil, peanut oil, Viscotrol C, phthalic ester, terephthalate, fatty group dibasic acid, polyol ester, benzene polyacid ester, acetate, caproic acid, oleic acid, stearic acid, ethylene glycol, glycerol, lauryl alcohol, hexadecanol, the stearyl alcohol for use; At least a in selection of auxiliary phenolic antioxidant, amine antioxidants, fatty acid quaternary ammonium salt class, soap class, alkylphenol polyoxyethylene, the carboxylicesters; With colorant, it is even with mixing kettle or colloidal mill thorough mixing that dilution material and auxiliary agent are formed weight ratio by institute's requirement, use three-roller again, or sand mill, or ball mill, or colloidal mill is ground to less than 15 μ and promptly makes the fluorescence falsification preventing permeability type atomic seal ink, or part dilution material and auxiliary agent will be added in the colorant, even with mixing kettle or colloidal mill thorough mixing, use three-roller again, or sand mill, or ball mill, or colloidal mill is ground to less than 15 μ, the dilution material and the auxiliary agent that add remainder again, the back evenly promptly makes the fluorescence falsification preventing permeability type atomic seal ink with mixing kettle or colloidal mill thorough mixing, or earlier with the colorant three-roller, sand mill, ball mill, or colloidal mill is ground to less than 15 μ, the back adds dilution material and auxiliary agent, evenly promptly make the fluorescence falsification preventing permeability type atomic seal ink with mixing kettle or colloidal mill thorough mixing again, the colorant in the fluorescence falsification preventing permeability type atomic seal ink is 1: 1～4: 0.01～1 with the final composition weight ratio of dilution material and auxiliary agent.
2, fluorescence falsification preventing permeability type atomic seal ink according to claim 1, it is characterized in that: be added with pigment dyestuff in the colorant, what form thus is the fluorescence falsification preventing permeability type atomic seal ink of showing one's color, and the weight ratio that metal-ion fluorescent title complex and pigment dyestuff and resin type link agent is followed successively by 1: 0.5～2: 2～5.
3, fluorescence falsification preventing permeability type atomic seal ink according to claim 1 is characterized in that: do not add organic pigment, what form thus is the concealed fluorescent anti-forgery penetrant atomic stamp pad ink.
4, according to claim 1 or 2 or 3 described fluorescence falsification preventing permeability type atomic seal inks, it is characterized in that: selected metal-ion fluorescent title complex is by Ga
3+Ion and rhodamine B or Eu
3+Ion and hexafluoroacetylacetone and triphenylphosphine oxide or Al
3+Ion and fluorescence gallium or Sm
3+Ion and 2-naphthalene-trifluoroacetone or Sc
3+Ion and oxine or Tb
3+Ion and naphthalene acetyl trifluoroacetone and tributyl phosphate or Sm
3+Ion and thiophene acetyl trifluoroacetone and vulkacit D or Ga
3+Ion and dihydroxyanthraquinone or In
3+The title complex that ion and 7 iodo 8 hydroxyquinoline 5 sulfonic acid ferr form.
5, fluorescence falsification preventing permeability type atomic seal ink according to claim 1 and 2 is characterized in that: selected pigment dyestuff is Oil Yellow or phthalocyanine green or bronze red or red or nigrosine or Pigment blue.
6, according to claim 1 or 2 or 3 described fluorescence falsification preventing permeability type atomic seal inks, it is characterized in that: it is the soya-bean oil modified alkyd resin that selected resin type links agent, and---long-oil-length or castor oil modified Synolac---long-oil-length or rosin modified phenolic resin or pure soluble polyamide or rubber resin or Synolac---oil content is 70 or No. 4, No. 3, stand oil and stand oil.
7, according to claim 1 or 2 or 3 described fluorescence falsification preventing permeability type atomic seal inks, it is characterized in that: selected dilution material is the ink oil or the machinery oil of 250～290 ℃ of Octyl adipate or machine oil or Viscotrol C or terephthalic acid didecyl ester or phenylcarbinol or boiling ranges---20.
8, according to claim 1 or 2 or 3 described fluorescence falsification preventing permeability type atomic seal inks, it is characterized in that: selected auxiliary agent is OP-7 and Resorcinol or tween-80 and antioxidant A P or OP-10 and antioxidant DOD or sodium laurylsulfate or sterol and distearyl acid quadrol or Syzygium aromaticum stem oil and triphenyl phosphite or polyethylene wax and butanols or Sorbitol Powder trioleate and p-aminophenol or oxidation inhibitor T-501 and dodecylbenzene phenol polyethenoxy ether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96104762A CN1050147C (en) | 1996-04-25 | 1996-04-25 | Anti-forgery penetrant atomic stamp pad ink and its prepn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96104762A CN1050147C (en) | 1996-04-25 | 1996-04-25 | Anti-forgery penetrant atomic stamp pad ink and its prepn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1139133A CN1139133A (en) | 1997-01-01 |
| CN1050147C true CN1050147C (en) | 2000-03-08 |
Family
ID=5118515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96104762A Expired - Fee Related CN1050147C (en) | 1996-04-25 | 1996-04-25 | Anti-forgery penetrant atomic stamp pad ink and its prepn |
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| Country | Link |
|---|---|
| CN (1) | CN1050147C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102140275A (en) * | 2010-02-01 | 2011-08-03 | 樊官保 | Printing oil ink capable of permeating to other side of paper and use thereof |
| CN101812254B (en) * | 2010-04-28 | 2012-04-04 | 王枫 | Colorless aqueous ink for printing watermark anti-counterfeiting identifier |
| CN101921507A (en) * | 2010-07-01 | 2010-12-22 | 中国人民解放军军事交通学院 | Aqueous anti-counterfeiting stamp ink |
| CN102898896A (en) * | 2012-11-09 | 2013-01-30 | 天津环球磁卡股份有限公司 | Fluorescence penetrable color-applying ink and preparation method thereof |
| CN104422667A (en) * | 2013-08-30 | 2015-03-18 | 首都师范大学 | Method and device for authenticating industrial art imitation |
| CN103525191A (en) * | 2013-09-30 | 2014-01-22 | 广州市溯达***用品有限公司 | Anti-fading stamp-pad ink and preparation method thereof |
| CN104263059A (en) * | 2014-09-05 | 2015-01-07 | 句容市给力包装制品厂 | Permeable number printing ink and preparation method thereof |
| CN106905758B (en) * | 2015-12-29 | 2020-08-18 | 惠州市随和科技有限公司 | Fluorescent stamp-pad ink and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058032A (en) * | 1991-08-24 | 1992-01-22 | 南开技术开发咨询公司 | Atomic printing ink for forgery prevention with ultraviolet ray |
-
1996
- 1996-04-25 CN CN96104762A patent/CN1050147C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058032A (en) * | 1991-08-24 | 1992-01-22 | 南开技术开发咨询公司 | Atomic printing ink for forgery prevention with ultraviolet ray |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1139133A (en) | 1997-01-01 |
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