Title of Invention

"FINGERPRINT DEVELOPING COMPOSITION AND METHOD THEREOF"

Abstract

The invention relates to a nano-sized fingerprint developing powder composition for detecting fingerprints. The ingredients of the composition are non-toxic. The composition disclosed in the invention is useful for detecting fingerprints on both absorbent articles as well as on non-absorbent materials. The present invention further provides a method for the preparation of the fingerprint developing powder composition and a method for detecting the fingerprints.

Full Text

FINGERPRINT DEVELOPING COMPOSITION AND METHODS THEREOF FIELD OF THE INVENTION The invention relates to a nano-sized fingerprint developing powder composition for detecting fingerprints. BACKGROUND OF THE INVENTION The conventional procedure for developing a latent fingerprint involves applying to the surface having such fingerprint thereon a small amount of a finely powdered solid material until the outline of the fingerprint becomes visible and then carefully spreading the applied powder over the fingerprint in order to bring out its pattern. Conventional fingerprint dusting powder pick up prints since the oil secreted by fingertips has a natural tackiness. In the course of time the oil tends to evaporate and, therefore, old fingerprints are difficult to detect by powder method. This problem is specifically relevant to India where hot climate prevails eight out of twelve months in a year. Nanoparticles have the ability to actively seek out oil, however small the amount may be. WO 2005/066632A1 discloses the use of a nanoparticle of siloxane derivative as the adhesive for fingerprinting composition wherein the particle is encapsulated in a fluorescent material and is derived from a sol-gel. The nanoparticle used is derived from cadmium sulphide and cadmium selenide optionally doped with rare earth atoms. US 4,176,205 discloses a fingerprint powder and method for developing latent fingerprints therewith, such powder comprised of a powder carrier, especially a mixture of silica and talc, containing a colouring agent, preferably a fluorescent dye. SUMMARY OF THE INVENTION The invention provides a nano-sized fingerprint developing powder composition for detecting latent fingerprints. The composition includes a non-toxic adhesive material coated with a fluorescent dye and hydrophobic seed extract. One aspect of the invention relates to a fingerprint developing powder composition comprising a non-toxic adhesive material coated with a mixture of fluorescent dye and hydrophobic seed extract. Another aspect of the invention relates to a process for the preparation of the fingerprint developing powder composition comprising: (a) grating seeds to obtain powder and suspending the powder in a suitable solvent to obtain a suspension, (b) filtering the suspension to obtain a filtrate, (c) mixing the filtrate with non-toxic adhesive material followed by sonication for suitable time, (d) evaporating the solvent from the mixture to obtain a residue, (e) adding fluorescent dye solution to the residue, (f) sonicating the mixture followed by evaporation to obtain a residue, (g) grinding the residue to obtain the fingerprint developing powder. Yet another aspect of the invention relates to a method of detecting fingerprints comprising applying the fingerprint developing powder composition on a sample surface, blowing off excess powder from the sample surface to expose the developed fingerprints and photographing the developed fingerprints on sample surface or observing the developed fingerprints on sample surface under a light source tool. DETAILED DESCRIPTION OF THE INVENTION The invention relates to a nano-sized fingerprint developing powder composition for detecting fingerprint. The fingerprint developing powder composition of the present invention is non-toxic and fluorescent; and develops sharp and clear fingerprints. The invention is able to detect fingerprints on a wide range of adsorbent and non-adsorbent material and detect weak latent impressions also. The composition is stable over prolonged periods of time. The composition is useful both in the laboratory, as well as at other locations. The ingredients of the composition are non-toxic. The composition poses no occupational hazard. The composition is not surface-specific; it may be use for detecting fingerprints on both absorbent articles (for example, paper, wood), as well as on non-absorbent materials (for example, glass, plastics). The fingerprints developed by the method disclosed in the invention are sharp, clear and visible to the naked eye. It takes just one minute to develop a fingerprint. Weak fingerprints may be enhanced after impinging the developed prints with radiation having 550 nm wavelengths and observing these through orange goggles. The method may be extended for developing sole prints and foot prints. The method is easy to use and may be used even by an amateurish person. The method requires neither a sophisticated instrument, nor costly equipment. One embodiment of the present invention provides a fingerprint developing powder composition comprising a non-toxic adhesive material coated with a mixture of fluorescent dye and hydrophobic seed extract. Another embodiment of the invention provides the non-toxic adhesive material that is either nanoparticles of aluminium oxide or meshed aluminium oxide. Yet another embodiment of the invention relates to the particle size of the composition that ranges from 30-60 nm. Still yet another embodiment of the invention relates to a fluorescent dye used in the fingerprint developing composition, the dye is selected from a group consisting of eosin yellow, lucifer yellow, nile red and fluorescence. Further embodiment of the invention provides the hydrophobic seed extract that is selected from a group consisting of gwar bean extract, French bean extract, cluster beans extract, mistletoe seed extract and trillium seed extract. Another embodiment of the invention provides a process for the preparation of the fingerprint developing powder composition, said process comprising: (a) grating or crushing seeds to obtain powder and suspending the powder in a suitable solvent to obtain a suspension, (b) filtering the suspension to obtain a filtrate, (c) mixing the filtrate with non-toxic adhesive material followed by sonication for suitable time, (d) evaporating the solvent from the mixture to obtain a residue, (c) adding fluorescent dye solution to the residue , (0 sonicating the mixture followed by evaporation to obtain a residue, and (g) grinding the residue of step (f) to obtain the fingerprint developing powder. In one embodiment the invention provides the seeds for the preparation of hydrophobic seed extracts wherein the seeds are selected from a group consisting of gwar bean seeds, Trench bean seeds, cluster beans seeds, mistletoe seeds and trillium seeds. In another embodiment the invention provides a solvent for the preparation of the suspension of the hydrophobic seed extract, wherein the solvent is selected from a group consisting of hexane, cyclohexane, pentane, diethyl ether and tetrahydrofuran. Further the invention provides a adhesive material, wherein the adhesive material is either nanoparticles of aluminium oxide or meshed aluminium oxide the particle size of the adhesive material ranges from of 30-60 nm. Further embodiment of the invention relates to the fluorescent dye used in the preparation of the fingerprint developing composition, said dye is selected from a group consisting of eosin yellow, lucifer yellow, nile red and fluorescence. Another embodiment of the invention provides a method of detecting fingerprints comprising applying the fingerprint developing powder on a sample surface, blowing off excess fingerprint developing powder from the sample surface to expose the developed fingerprints, and photographing the developed fingerprints on sample surface or observing the developed fingerprints on sample surface t under a forensic light source tool. The invention provides a nano-sized fingerprinting dusting composition for detecting latent fingerprints. Composition includes a non-toxic adhesive material coated with a fluorescent dye and hydrophobic seed extract. The non-toxic adhesive material used is either nanoparticles of aluminium oxide or meshed aluminium oxide. The non-toxic adhesive material has a particle size in the size of range 30-60 nm. The adhesive particles are coated with a fluorescent dye and a hydrophobic substance. The fluorescent dye is used to enhance weak fingerprints often found at crime scenes, under a light source. The fluorescent dye used is FDA recommended eosin yellow, lucifer yellow, nile red and fluorescein. It is non-toxic and is used for biological staining procedure. The hydrophobic substance is used to detect fingerprints on moist surfaces. The hydrophobic constituent repels water and allows the powder particles to stick to the oily component of the latent fingerprint, impinged on a wet or sticky surface. The hydrophobic material used in the invention is the seed extract. The seed extract has been prepared from various seeds like gwar bean; french beans, mistletoe and trillium. The extract from these seeds have high sticking characteristics. A method for the preparation of a novel, non-toxic nano-sized fingerprint developing powder composition is disclosed. The method includes grating the seeds to powder and suspending the powder in a solvent to obtain a suspension, which is then stirred for 2 - 2.5 hours and allowed to stand overnight. The suspension is then filtered and the filtrate is added to the non-toxic adhesive material which has a particle size in the range of 30-60 nm and a surface area of 43 m2g-1. The mixture is sonicated for 1-1.15 hours and the solvent is evaporated under natural conditions to obtain a residue. A fluorescent dye solution is then added to the residue. The mixture is further sonicated for 1-1.15 hours and the solvent evaporated to obtain a residue. The residue thus obtained is ground to a fine. The detailed procedure of the preparation using gwar bean seed extract, French bean seed extract is provided in the Example 1-4. The invention also provides for a method of detecting fingerprints. The method includes applying the fingerprint developing powder on a sample surface (paper, glass, plastic etc.) with a camel hair brush. The excess powder is blown off from the sample surface having the fingerprint thereon to distribute the powder uniformly on the surface in order to expose the developed fingerprint. Further the developed sample surface containing the developed fingerprint is photographed or the developed sample surface containing the developed fingerprint is observed under a forensic light source tool. The sample surface is. for example paper, plastic, glass, bakelite, enamelled metals, polished wood, etc. It is particularly useful for detecting latent imprints on glossy, multi-colour surfaces. EXAMPLES It should be understood that the following examples described herein are for illustrative purposes only and that various modifications or changes in light will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application and the scope of the appended claims. Example 1 Preparation of fingerprint developing powder composition using gwar bean extract 5-6 g of gwar bean seeds were grated and powder was suspended in 50-55 ml of hexane. The suspension is stirred for 2-2.5 hours and allowed to stand overnight. Suspension was filtered and the filtrate added to 0.5 -0.52 g nanoparticles of aluminium oxide (particle size 40 nm and surface area 43 m2g-1). The mixture was sonicated for 1-1.15 hours and kept at room temperature for hexane to evaporate to obtain a residue. Eosin yellow dye solution (0.010-0.012 g of eosin yellow dye dissolved in 10-10.5 ml of distilled water) was added to the obtained residue. The mixture was again sonicated for 1-1.15 hours and kept at room temperature for water to evaporate to obtain a residue. The obtained residue was ground to fine powder to obtain a fingerprinting developing powder. Example 2 Preparation of fingerprinting developing powder using French been extract 5-6 g of french bean seeds were grated and powder was suspended in 50-55 ml of hexane. The suspension was stirred for 2-2.5 hours and allowed to stand overnight. Suspension was filtered and the filtrate added to 0.5 -0.52 g nanoparticles of aluminium oxide (particle size 40 nm and surface area 43 m2g-1). The mixture was sonicated for 1-1.15 hours and kept at room temperature for hexane to evaporate to obtain a residue, lucifer yellow dye solution (0.010-0.012 g of lucifer yellow dye dissolved in 10-10.5 ml of distilled water) was added to the obtained residue. The mixture was again sonicated for 1-1.15 hours and kept at room temperature for water to evaporate to obtain a residue. The obtained residue was ground to fine powder to obtain a fingerprinting developing powder. Example 3 Preparation of fingerprinting developing powder 5-6 g of gwar bean seeds were grated and powder was suspended in 50-55 ml of hexane. The suspension was stirred for 2-2.5 hours and allowed to stand overnight. Suspension was filtered and the filtrate added to 0.5 -0.52 g meshed aluminium oxide (particle size 40 nm and surface area 43 m2g-1). The mixture was sonicated for 1-1.15 hours and kept at room temperature for hexane to evaporate to obtain a residue. Eosin yellow dye solution (0.010-0.012 g of eosin yellow dye dissolved in 10-10.5 ml of distilled water was added to the obtained residue. The mixture was again sonicated for 1-1.15 hours and kept at room temperature for water to evaporate to obtain a residue. The obtained residue was ground to fine powder to obtain a fingerprinting developing powder. Example 4 Process for the preparation of fingerprinting developing powder 5-6 g of gwar bean seeds were grated and suspended in 50-55 ml of hexane. The suspension was stirred for 2-2.5 hours and allowed to stand overnight. Suspension was filtered and the filtrate was added to 0.5 -0.52 g nanoparticles of aluminium oxide (particle size 40 nm and surface area 43 m2g"'). The mixture was sonicated for 1-1.15 hours and kept at room temperature for hexane to evaporate to obtain a residue. Lucifer yellow dye solution (0.010-0.012 g of lucifer yellow dye dissolved in 10-10.5 ml of distilled water) was added to the obtained residue. The mixture was again sonicated for 1-1.15 hours and kept at room temperature for water to evaporate to obtain a residue. The obtained residue was ground to fine powder to obtain a fingerprinting developing powder. VWe Claim: 1. A fingerprint developing powder composition comprising a non-toxic adhesive material coated with a mixture of fluorescent dye and hydrophobic seed extract, wherein the particle size of the non-toxic adhesive material is in the range of 30 nrn to 60 nrn. 2. The composition as claimed in claim 1, wherein the non-toxic adhesive material is either nanoparticles of aluminium oxide or meshed aluminium oxide. 3. The composition as claimed in claim 1, wherein the fluorescent dye is selected from a group consisting of eosin yellow, lucifer yellow, nile red and fluorescence. 4. The composition as claimed in claim 1, wherein the hydrophobic seed extract is selected from a group consisting of gwar bean extract, french bean extract, cluster beans extract, mistletoe seed extract and trillium seed extract. 5. A process for the preparation of the fingerprint developing powder composition as claimed in claim 1, said process comprising: (a) grating seeds to obtain powder and suspending the powder in a suitable solvent to obtain a suspension, (b) filtering the suspension of step (a) to obtain a filtrate, (c) mixing the filtrate of step (b) with non-toxic adhesive material followed by sonication for suitable time, (d) evaporating the solvent from the mixture of step (c) to obtain a residue, (e) adding fluorescent dye solution to the residue of step (d), (f) sonicating the mixture of step (e) followed by evaporation to obtain a residue, and (g) grinding the residue of step (f) to obtain the fingerprint developing powder. 6. The process as claimed in claim 5, wherein the seeds are selected from a group consisting of gwar bean seeds, fiench bean seeds, cluster beans seeds, mistletoe seeds and trillium seeds. 7. The process as claimed in claim 5, wherein the solvent is selected from a group consisting of hexane, cyclohexane, pentane, diethyl ether and tetrahydrofuran. 8. The process as claimed in claim 5, wherein the adhesive material is either nanoparticles of aluminium oxide or meshed aluminium oxide. 9. The process as claimed in claim 5, wherein the adhesive material has a particle size of 30-60 nm. 10. The process as claimed in claim 5, wherein the fluorescent dye is selected from a group consisting of eosin yellow, lucifer yellow, nile red and fluorescence. 11. A method of detecting fingerprints, said method comprises: (a) applying the fingerprint developing powder composition of claim 1 on a sample surface, (b) blowing off excess fingerprint developing powder from the sample surface to expose the developed fingerprints, and (c) detecting the developed fingerprints on sample surface using a light source.

Documents:

1639-del-2006-Abstract-(08-02-2013).pdf

1639-del-2006-abstract.pdf

1639-del-2006-Claims-(08-02-2013).pdf

1639-del-2006-claims.pdf

1639-DEL-2006-Correspondence Others-(08-02-2013).pdf

1639-del-2006-Correspondence Others-(19-04-2012).pdf

1639-del-2006-correspondence-others.pdf

1639-del-2006-description (complete).pdf

1639-del-2006-form-1.pdf

1639-del-2006-Form-13-(08-02-2013).pdf

1639-del-2006-form-2.pdf

1639-del-2006-form-26.pdf

1639-del-2006-form-3.pdf

1639-del-2006-form-5.pdf

1639-del-2006-GPA-(19-04-2012).pdf