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Bit more info took this stone to a belt sander with a 80 grit belt to try and flatten the surface and slow proggress man this thing is hard, but got the colour a bit more regular brown with yeloow...

I found this old hone today in a junk shop today, paid 2 pounds so big deal if its no good. It had what looked like a crack in the middle and when I took it out the box it was in two bits, cleaned...