ASTM E1588

ASTM International standard practice for gunshot residue analysis by scanning electron microscopy with energy-dispersive spectrometry. Defines particle classification (characteristic, consistent-with, indicative), morphology criteria (spheroidal, fused, 0.5 to 10 micrometre), elemental panels (classical Pb-Sb-Ba and lead-free variants), and reporting language. The Indian CFSL GSR SOPs are aligned to this standard.