iLG Dust Footwear Enhancement Reagent – For Alkaline Dust Traces
Bromocresol blue is a pH indicator. Calcium carbonate in dust becomes alkaline after hydrolysis and reacts with bromocresol blue, causing a color change that enhances the contrast between the dust trace and the background, thereby visualizing the dust trace.
Reference standard:
GA/T 1680-2019 - Forensic sciences — Enhancement method for planar dust traces using bromocresol blue

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