Sodium rhodizonate
A chelating agent producing a scarlet-to-red colour with lead ions at acid pH. Applied to entry-wound margins and garment entry holes to map lead distribution. Not specific to primer lead; provides supplementary spatial evidence. Applied after Modified Griess and after photographic documentation.
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Modified Griess testAzo dyeAAS (atomic absorption spectrometry)BSA 2023 (Bharatiya Sakshya Adhiniyam)Contact woundDeHaan modificationDesensitisation (Griess protocol)GFAAS (graphite furnace AAS)ICP-MS (inductively coupled plasma mass spectrometry)Lead-free primerNAA (neutron activation analysis)NEDA (N-(1-naphthyl)ethylenediamine dihydrochloride)