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Thanks Oz. That's explains it then!

Some of you asked, so I have included some more pictures. I gave the hone another lap with 400 wet 'n dry, and you can see the slurry is light grey in colour. I included a close up as well. There are...

Thanks again all.

Neil - I think you're right. I'm pretty confident the staining has come from something introduced to the stone. That side of the stone is a bit oily, and I think it might be...

The slurry was grey, but a very light grey and almost white - definitely a lot lighter than the stone colour. I would have said the same but didn't realise it made a lot of difference. Thanks...

Just thought I'd add, the dimensions of this stone are exactly 5 inches x 2.5 inches by about 5/8 inch.

Thanks everyone. With your suggestions I looked through the Wiki and thought it looks suspiciously like the Escher picture in the SRP wiki: File:J.G. Escher Sohn Water Razor Hones 1.JPG - Straight...

Lapped it with 80, 180 and 400 wet and dry. It probably took about 40 mins to get it nice and smooth, so it wasn't ultra hard but it did take a bit of effort. The slurry was a grey color.

Thanks for the replies! I'll put a blade to it and see how it goes...

Fellow enthusiasts,

I recently stumbled on this honing stone amongst some rubble on a friends building site. Turns out it was in old fishing boat that my friend received as payment for doing a...