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pink or brown in creams containing salicylic acid
The reason for the color change to pink or brown in creams containing salicylic acid may be the effect of pH or the formation of salt or…
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5 Replies
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Mostly because of light and air exposure, which is oxidation. Impurities or interactions with other ingredients in the formulation might be the culprit, too.
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Add some EDTA
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Ever noticed the color change in creams with salicylic acid? It’s like a chemistry experiment on your skin! The shift to pink or brown might be influenced by pH or the formation of salts. Science meets skincare in the most colorful way.
@tunnel rush, how do you think?
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“Synthetic SA is white and odorless whereas natural SA, derived from the hydrolysis of methyl salicylate, may have a slight pink or yellow tint and a faint wintergreen-like odor.”
cosmeticsandtoiletries.com
Ingredient Profile: Salicylic Acid
2-Hydroxybenzoic acid, or salicylic acid (SA), is among the most important medicinal compounds ever discovered. Since ancient times, humans have benefited from the therapeutic effects of naturally occurring SA precursors, which readily metabolize to SA and provide analgesic, anti- inflammatory … Continue reading
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“However, methyl
salicylate does display the normal
instability innate to the salicylate
group; a pink-red discoloration in
contact with traces of iron salts.”Source: https://img.perfumerflavorist.com/files/base/allured/all/document/2016/02/pf.9902.pdf
I believe the pink color drift might be caused by methyl salicylate remains in the natural salicylic acid, when in contact with traces of iron
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