3/22/2023 0 Comments Fingerprint inkMany of the tube inks used in the tube/roller system suffer the disadvantages of: excessively staining the skin requiring solvent or special cleaners for cleaning of tools and of the skin separating into layers of clear oil and black paste while in the tube drying rapidly so as to require immediate clean-up, as opposed to being reused at a later time if left on the plate and roller having a slippery consistency, which makes coating the fingers somewhat difficult and may result in smudged images on the recording medium. This system is referred to hereinafter as "tube/roller system". The fingertips were then rolled or pressed onto a suitable recording surface, made of paper, for example. For many years fingerprints were obtained by dispensing a viscous carbon black pigmented ink, i.e, in a gel or paste form, from a tube onto a plate or other flat surface and rolling the fingertips of the person to be fingerprinted over the plate. and subsequently transferred to a recording medium to provide a pattern corresponding to the person's fingerprints, palm prints, etc.įingerprints have been widely used for many years to positively identify people. The present invention relates to ink to be applied to a person's fingertip's etc. The invention of claim 11 wherein the agglomerate size of the carbon particles falls within the range of about 20-50 millimicrons. The invention of claim 19 wherein the percentage of ink, by weight, of low structure carbon dispersion falls within the range of 0.3% to 2%.Ģ1. The invention of claim 18 wherein the low structure carbon dispersion comprises less than 2%, by weight, of the ink.Ģ0. The invention of claim 17 wherein the low structure carbon dispersion comprises less than 5%, by weight, of the ink.ġ9. The invention of claim 16 wherein the low structure carbon dispersion comprises about 10% or less, by weight, of the ink.ġ8. The invention of claim 15 wherein the carrier comprises an oil selected from the group consisting of napthenic and paraffinic mineral oils.ġ7. The invention of claim 14 wherein the carrier is selected from the group of nonvolatile oils and nonvolatile oil complexes.ġ6. The invention of claim 11 wherein the carrier consists of one or more materials selected from the group of nonvolatile oils, nonvolatile oil complexes, fatty alcohols and fatty acid esters.ġ5. The invention of claim 12 wherein the resins comprise alkyd resins.ġ4. The invention of claim 11 wherein the oleo resin comprises a blend of aliphatic hydrocarbon soluble resins.ġ3. The invention of claim 9 wherein the percentage of ink, by weight, of low structure carbon dispersion falls within the range of 0.3% to 2%.Ī low structure carbon dispersion in which carbon particles are dispersed in a hydrocarbon soluble oleo resin with the agglomerate size of the carbon particles being less than 50 millimicrons, the carbon particles accounting for about 40% to 60% of the total dispersion and a solvent carrier, the low structure carbon dispersion comprising about 20% or less, by weight, of the ink.ġ2. The invention of claim 8 wherein the low structure carbon dispersion comprises less than 2%, by weight, of the ink.ġ0. The invention of claim 6 wherein the low structure carbon dispersion comprises less than 5%, by weight, of the ink.ĩ. The invention of claim 6 wherein the low structure carbon dispersion comprises about 10% or less, by weight, of the ink.Ĩ. The invention of claim 5 wherein the agglomerate size of the carbon particles is about 30 millimicrons.ħ. The invention of claim 2 wherein the agglomerate size of the carbon particles is less than 50 millimicrons.Ħ. The invention of claim 3 wherein the carrier comprises an oil selected from the group consisting of napthenic and paraffinic mineral oils.ĥ. The invention of claim 2 wherein the resins comprise alkyd resins.Ĥ. The invention of claim 1 wherein the oleo resin comprises a blend of aliphatic hydrocarbon soluble resins.ģ. A low structure carbon dispersion in which carbon particles are dispersed in an oleo resin with the agglomerate size of the carbon particles being less than about 100 millimicrons, the carbon particles accounting for about 40% to 60% of the total dispersion and a carrier selected from the group consisting of nonvolatile oils, nonvolatile oil complexes, fatty alcohols and fatty acid esters, the low structure carbon dispersion comprising about 20% or less, by weight, of the ink.Ģ.
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