Marking Out Cabochons

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Joined
Sep 12, 2016
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Mornington Peninsula
Just what do you use to mark out a cabochon on really dark coloured stones ? Sharpie fine point or pencil is ok on lighter stuff but I've got a bit of Labrodorite and the only white markers are paint based, they take forever to dry and smudge easily.
Hints please :(
 
Sharpen an aluminium rod to a pencil point. You will be able to see it well, even when wet.

Some people use aluminium welding rod, it is about the thickness of the lead in a pencil.
 

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