There are people who consume flavored crystal DHMO recreationally. Children even!

Exactly the same!

I still admire and am super thankful to @ruud for all the time, effort and money he and his friends are pouring into trying to optimize world.

Burn, probably not. After all we can dip our hands in hot water for hours and feel fine. Bloodflow would take away a large part of this heat.

If you were to dip yourself in such a liquid, you would probably risk hyperthermia really quick though.