Tert-butylhydroquinone appears as white to light tan crystalline powder or a fine beige powder. Very slight aromatic odor. (NTP, 1992)
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Functions
Antioxidant
Fights free radicals — the unstable molecules from UV, pollution, and stress that break down collagen and cause premature aging.
Perfuming
Added for scent. Can be natural or synthetic. Common irritant and allergen — one of the top reasons people react to products.
Neutralizes Free Radicals
Traditional Use
Tertiary butylhydroquinone was developed in the mid-20th century as a synthetic antioxidant preservative for fats and oils, later adopted in cosmetics to prevent rancidity and product degradation.