Tomato Sauce
Tomato's red colour comes from lycopene, a fat-soluble carotenoid pigment. It needs both degreasing and acid-breaking treatment — and remarkably, UV light continues to break it down after washing.
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Frequently asked questions
Why does sunlight remove tomato stains?
Lycopene (tomato's red pigment) is degraded by UV radiation. Hanging treated clothes in direct sunlight is a genuinely effective finishing step, not folk wisdom.