The green part of a potato should be discarded. It is bitter, and more than that, it contains solanine, which eaten in great quantities can cause illness. Solanine is an alkaloid which is colorless.

How do I know if my potatoes have solanine?

But how do you know when solanine is present in a potato? The tuber is turning green. Though the green color that forms on the skin of a potato is actually chlorophyll, which isn't toxic at all (it's the plant's response to light exposure), the presence of chlorophyll indicates concentrations of solanine.

How do you remove solanine from potatoes?

Thereby, high quality processed potatoes having no puckery taste are produced. CONSTITUTION: Solanin is removed from potatoes by dipping the potatoes in vinegar of 30-60 deg. C, containing 0.3-1.0 vol% of acetic acid, for 2-5 minutes.