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Formaldehyde-releasing preservative (FRP)

A preservative that slowly releases formaldehyde as its antimicrobial active ingredient. The five principal FRPs in cosmetics are quaternium-15, DMDM hydantoin, imidazolidinyl urea, diazolidinyl urea, and bronopol. Permitted in the EU at maximum 0.2% free formaldehyde (Annex V); mandatory label declaration above 0.05% free formaldehyde.

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Ammoniated mercuryEU Regulation 1223/2009Galena (PbS)Kohl (kajal, surma, al-kohl)MoCRA 2022Nash reagent methodRAPEX / Safety GateRhodamine BTyrosinase inhibition

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