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5-Methylthioninhydrin (5-MTN) is a reagent for fingerprints that combines the favorable characteristics of ninhydrin (strong color) and those of DFO and 1,2-IND (strong fluorescence).
5-MTN-developed fingerprints have a stronger color than those developed with regular ninhydrin. Therefore, the working solution can have a lower concentration (at 3 g per liter, the strength of the color is about the same). After treatment with zinc chloride, 5-MTN-developed prints do not become orange, but a more reddish colored purple. The fluorescence of the fingerprint is better than DFO.
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