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Nash reagent method

The EU reference colorimetric method for free formaldehyde in cosmetics: formaldehyde reacts with ammonium acetate and acetylacetone to produce the yellow 3,5-diacetyl-1,4-dihydrolutidine chromophore, measured at 412 nm. Sensitivity approximately 1 mg/kg (1 ppm) free formaldehyde.

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Ammoniated mercuryEU Regulation 1223/2009Formaldehyde-releasing preservative (FRP)Galena (PbS)Kohl (kajal, surma, al-kohl)MoCRA 2022RAPEX / Safety GateRhodamine BTyrosinase inhibition

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