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Where would I find such a thing? I have found blocks like this and syringes but not crayons.

Here it is

Its green. Still not the right stuff?

Its kind of a rectangle like a slightly smaller snickers bar. Its quite chalky and hard, brittle. Is this the same stuff?

I thought I was ordering strop past but what I got is green polishing compound. It is pretty hard and brittle. Anyone know what the intended use of this is? Do I break a piece of and work it in with...