I didn't know where to put this since it pertains to both chemistry and biology so i put it here. One time i accedently spilt 31.45% concentrated HCl on my skin and didn't notice it right away but then i saw this fuming drop on my skin and i immediately washed it off, it never tingled, burned, left a mark ect. I was very surprised. I have never gotten a chemical burn in my life, nothing. I have been working with caustic chemcals for 2yrs now and i have had multiple experiences like that. Can anyone tell me if our skin produces natural buffers that neutralise small amounts of caustic chemicals? I do not do these things intentionally in case anybody was wondering.