So someone asked me if they can use apple cider vinegar to replicate the effect of the Hei Ba Gao. I think it does. Vinegar has a shrinking effect. The Hei Ba Gao uses black rice vinegar and apple cider is also a vinegar. I will try some and update. But I do know that too much vinegar on the skin is very drying. They have changed the name of the Hei Ba Gao black paste to Black Scar Masque. Same thing to me.