Good to hear about the Un-Do. Yeah i'd say your shellite was old.

I have glass petri dishes, dropped brand new shellite and left nothing at all.

I wonder what the life span is on those bottles before they degrade?

Xylene is currently available at my local hardware store, but it wont be stocked everywhere, for i was there the other day and they only had shellite.

But i heard Xylene leaves a residue, so i might pass..

Just found out my local shop sells shellite $2.50 cheaper than bunnings, so will grab a few from there instead for my next extraction, unless i find some toluene..