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a sharpening test won´t tell you much. Make a picture and show it to us.
Lap the surface and look at the colour of the slurry, this should indicate what it is. If it´s a BBW it must be purple.
Put...

I´m not sure if I get the question.

Coticules are being sold with a backup for stability.
Nowadays most coticules come with a slate backing.

Vintages ofte came with blue belgians because they...