I dont know much about it... but it is another form of extract, that can be applied to normal skin (not just the skin around the anus, mouth, genitals, or niples) and creates another sensation that is simular to heat. At high concentrations it can however be a blistering agent.

You missed the one that I am most interested in... Bonjela

That is a chemical used to numb babys teath... it can be great for using a sub in a certain way while leaving less enjoyment for him/her. aka apply to niples/clit/penis to numb the area..

I also forgot Alchool, Great for incuraging burning on wounds, and can be used to dry the female Genitals...

Vinager is another one... I know there are others... I am just triing to find them all...