Battery acid...

...strange circumstances in which this happened...

However, getting battery acid all over your hands makes them go soapy - very oddly soapy - this I should have remembered from school science lessons.

To then assume it is a substance identifiable my tasting it I would recommend do not do, your hands may go soapy, but your tongue will burn instantly.

Needless to say I have nicely smooth but slightly flaky hand skin,

And a burn on my tongue the size of a finger print.

Here endeth the lesson.