Im assuming it isn’t because bleach is just a really good white paint.
In: Chemistry
[Many](https://en.wikipedia.org/wiki/Beta-Carotene) [dyes](https://en.wikipedia.org/wiki/Quinoline_Yellow_WS) and [pigments](https://en.wikipedia.org/wiki/Azorubine) are [long](https://en.wikipedia.org/wiki/Fast_Green_FCF) [conjugated](https://en.wikipedia.org/wiki/Patent_Blue_V) [organic](https://en.wikipedia.org/wiki/Tartrazine) chemicals which can be broken down by oxidizers such as bleach or hydrogen peroxide. It’s also why [old signs and posters will lose their brilliant reds and yellow](https://www.alamy.com/stock-photo/faded-poster.html)s if you’ve ever noticed convenience stores or hair salons with strangely blue signs. UV degradation from sunlight is another way that these molecules will break down into smaller parts which are either colorless or dull yellowish.
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