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If you realy want to take it out then before sweating it out try just simple tapping it either on the edge of your palm or if more force needed on the piece of soft wood. That gets them usualy free...

With some stones which are clogged up with crud it is easier to get the crud out of them by thinning it with kerosene and then degrease as usualy.

This pattern is the one which makes it hard to decide LI or CF. My $ is oh LI due to flaking.