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DeHaan modification

A refinement of the Griess test procedure for forensic propellant residue detection, using a combined sulphanilic acid + NEDA reagent on filter paper for the contact transfer. Attributed to John DeHaan and widely referenced in US forensic firearms literature.

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Related terms

Azo dyeBSA 2023 (Bharatiya Sakshya Adhiniyam)Contact woundModified Griess testNEDA (N-(1-naphthyl)ethylenediamine dihydrochloride)NIJ Range Estimation GuidelinesSodium rhodizonateStippling (tattooing)Test-fire envelope

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