| 摘要 |
An inkless fingerprint compound includes a solvent, a color former, such as a transistion metal salt, compatible with the solvent and a developer such as hydroxiquinoline and derivatives, the developer capable of reacting with the color former to form a colorant product, preferably black in color. A sufficient amount of a chelating agent, such as a carboxylic acid, is added to the solution to prevent the color former and developer from reacting while in solution to form the colorant product while permitting such reaction when the solution is applied to the fingerprint area of the person to be fingerprinted and deposited onto a paper substrate.
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