silicone is a very complicated compound made from crude oil, could be a chemical reaction but that's unlikely, colour disfiguration could come from not being cleaned enough
dirt
yello paint
photosyntosis
Most likely it's the end of the peas' growing season in which they will turn yellow and die off.
Lily leaves turn yellow due to a lack of nutrients, such as nitrogen, or excessive watering, which can lead to root rot. This causes the leaves to lose their green color and turn yellow.
Zucchinis turn yellow after picking due to the natural ripening process, which causes the chlorophyll in the vegetable to break down and reveal the yellow pigments underneath.
Some varieties of tomato have yellow fruits and therefore this is perfectly normal.
Cucumbers turn yellow due to overripening or exposure to sunlight, which causes a pigment called chlorophyll to break down and reveal the yellow pigments underneath.
Weil's Disease is also known as Leptospirosis. It causes kidney failure, bleeding and causes a person to turn the color yellow.
You an get yellow spots in your hair if you're out in the sun lots of the time. you can also get orange-ish highlights for the same thing
Beta Carotene can appear yellow, orange, or brown depending on its concentration. A dilute mixture of beta carotene will appear yellow as there isn't enough of it to absorb the extra light needed to make it appear orange.
The drywall wasn't primed properly.