Excuse me, I want to buy liquid nitrogen used to treat sores in Tianjin Hospital.

Liquid nitrogen doesn't work well, it's just frozen. I grew this thing since I was a child, but it hurts when I light it. I tell you to use a Chinese medicine called duck egg, which is very cheap and corrosive. It is best to use it in summer. You can apply it to boils. It's absolutely easy to use. I have used many therapies, and this effect is very good.