Sweat & Deodorant
Sweat stains are caused by a chemical reaction between proteins in sweat and the aluminium salts in antiperspirant, which oxidise and turn yellow over time.
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Frequently asked questions
Why do armpit stains turn yellow?
The yellow colour is caused by a reaction between aluminium-containing antiperspirant and proteins in sweat. The compound oxidises over time, deepening the yellow colour.
Does bleach fix yellow armpit stains?
No — bleach reacts with the aluminium salt residue and can actually make the yellowing worse and permanent. Use hydrogen peroxide instead.