Title of Invention

A FINGER PRINT POWDER COMPOSITION AND A PROCESS THEREOF

Abstract

This invention relates to a fingerprint powder containing 60-65% of Rose Bengal Dye and 35-40% of an adhesive such as described herein. A process for the preparation of fingerprint powder which comprises in adding 35 to 40% of an adhesive such as Calcium fluoride, Calcium Carbonate, Barium Sulphate, Zinc Carbonate to 60-65% of Rose Bengal Dye in water, allowing the solution to dry at room temperature, grounding the dried mass into fine powder, mixing this dried powder to talc.

Full Text

FIELD OF INVENTION A process for the preparation of a finger print powder composition and a process thereof. PRIOR ART The application of finely divided materials and the subsequent removal of the excess powder by brushing, blowing or tapping has been the universal method of intensifying fingerprints on non-absorbent surfaces. The technique relies on the mechanical adherence of fingerprint powder to moisture and oily components of skin ridge deposits. Regular fingerprint powders consist of a resinous polymer for adhesion and a colorant for contrast. A disadvantage associated with the known powders is that they are toxic in that the inorganic salts present therein constitute a health hazard. Further, such known powders incorporate costly, resinous, polymeric adhesives like silica gel, starch or rosin and are often ineffective for developing weak prints. OBJECTS OF THE PRESENT INVENTION An object of this invention is to propose a process for the preparation of a novel organic fingerprint powder. Another object of this invention is to propose a process for the preparation of an organic fingerprint powder which obviates the disadvantages associated with those of the prior art. Still another object of this invention is to propose a process for the preparation of an organic fingerprint powder which is nontoxic. Yet another object of this invention is to propose a process for the preparation of an organic fingerprint powder which provides sharp, clear prints, visible even to the naked eye. A further object of this invention is to prepare a novel organic fingerprint powder. DESCRIPTION OF THE PRESENT INVENTION According to this invention there is provided a composition of fingerprint powder containing 60-65% Rose Bengal Dye, 35-40% of an adhesive such as described herein and talc. Further, according to this invention there is provided a process for the preparation of fingerprint powder which comprises in adding 35 to 40% of an adhesive to 60-65% of Rose Bengal Dye in aqueous system such as water, the mixture is dried at room temperature for 4 to 7 days, dried mass is ground into a fine powder followed by mixing with talc. carbonate a) b) c) d) e) f) 9) The present fingerprint powder contains 60-65% Rose Bengal Dye and 35-40% of an adhesive material like calcium fluoride, calcium carbonate, barium sulphate or zinc It is prepared in the following steps: Weighed quantity of disodium Rose Bengal was placed in a beaker and dissolved in a minimum quantity of water. Weighed amount of adhesive material was placed in a china dish. the The solution of Rose Bengal was poured in china dish containing the adhesive. to dry at room The contents were allowed temperature for 4-7 days. a mortar and The dried mass was ground with pestle to fine powder. about 0.020-the contents For every one gram of the powder, 0.025 gram of talc was added and were thoroughly mixed. The formulation was stored in a tightly stoppered bottle. ADVflNTflGES OF PRESENT INVENTION The fingerprint powder of the present invention has the following advantages. 1. It is non-toxic. Rose Bengal analytical reagent. is used as an It is able to give sharp, clear prints, even to the naked eye. visible 3. Its ingredient, Rose Bengal, is a fluorescent dye. Therefore, weakprints may be developed under ultraviolet light. 4. It improves the cost performance by incorporating Cheap, insoluble salts like calcium fluoride calcium carbonate, barium sulphate or zinc carbonate in place of costly resinous polymers used in conventional powders. The cost of adhesive is reduced by 37-907. by using the present formulation. 5. It can develope latent fingerprints on paper, currency notes, postal stamps, laminated sheets, bonechine and melmoware crockery, glassware, steel equipment, bakelite switches, polished furniture and enamelled utilities like cars, washing machines and refrigerators. It gives prints on currency notes on which even the widely used ninhydrin method fails. It gives good quality prints on lamination and polythene sheets for which the conventional powders fail. In fact, for developing prints on lamination and polythene surfaces neutron activation analysis has to be used and this facility is normally not available in most forensic science laboratories. Fig.l of the accompanying drawings shows the chemical formula of Rose Bengal Dye. Figs 2(a) to 2(h) show the sharp and clear prints obtained on paper, glassware, steel, furniture, porcelian, lamination, polythene and bakelite respectively. + We Claim: 1. A fingerprint powder composition containing 60-65% Rose Bengal Dye, 35-40% of an adhesive such as described herein and/ talc. 2. A fingerprint powder as claimed in claim 1 wherein said adhesive is selected from such as calcium fluoride, calcium carbonate, barium sulphate, zinc carbonate. 3. A fingerprint powder substantially as herein described. 4. A process for the preparation of fingerprint powder which comprises in adding 35 to 40% of an adhesive such as described herein to 60-65% of Rose Bengal Dye in water, the mixture is dried at room temperature for 4 to 7 days, dried mass is ground into a fine powder followed by mixing with talc. 5. A process as claimed in claim 5 wherein said adhesive is selected from such as calcium fluoride, calcium carbonate barium sulphate, zinc carbonate.

Documents:

1600-1997-del-abstract.pdf

1600-1997-del-claims.pdf

1600-1997-del-correspondence-others.pdf

1600-1997-del-correspondence-po.pdf

1600-1997-del-description (complete).pdf

1600-1997-del-drawings.pdf

1600-1997-del-form-1.pdf

1600-1997-del-form-19.pdf

1600-1997-del-form-2.pdf

1600-1997-del-form-3.pdf

1600-1997-del-gpa.pdf