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Once you lap it you'll know in about two seconds if it's a blue. Purple slurry = blue belgian, it's that simple. As for the color of the rock itself, that can vary – anything from blue to purple to...

That's a blue-yellow glued combo alright. Very nice stone. You'll get used to 4x2. Maybe not ideal for serious elbow-grease honing but for touch-ups and finishing it's a great size.

Glued...