Thread: Should I have this Coticule bout cut?

BBW stands for Belgian Blue Whetstone. They are usually slower and coarser than Coticules. Coticule veins go through BBW so some Coticule whetstones are naturally bonded with BBW, others are backed by slate. Vintage Coticules were backed by BBW. In Coticules you can sometimes see lines and/or spots which are harmless manganese inclusions iirc.

Without side pictures it's mere speculating but it could be a thin BBW layer within a Coticule layer. It wouldn't be a whole lot better though.

Where can we find more info about this so called blushing?