The green color that forms on the skin is actually chlorophyll which isn't toxic but indicates the presence of the toxin solanine which is a defense mechanism against pests.

土豆皮上绿色实际上是叶绿，它是无毒，表明有毒存在，是一种防御害虫机制。

All potatoes contain two natural toxins called solanine and chaconine.

所有土豆都含有两种天然毒， 称为龙葵和查。