When peeling, taro will ooze a milky juice, which is very exciting. When you touch your hand, you will feel itchy, and washing it with water will not help.

Experiments show that this itch-causing substance-saponin can only be destroyed by heating.

So when scraping taro, if you feel itchy, bake it on the fire. The saponin sold on my hand was destroyed, so my hand stopped itching.