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There was a lot of discussion on Black Polish, crocus finish a few years ago.

Seal and Walrus skin squares were glued on end to a large wooden wheel, then a slurry of various secret formulas of...

As said look at Mike, Wolfpack 34’s work, especially his 2 tone black polish and satin finishes.

Lots of photos posted, search Wolfpack34.

All the big bucks super black finished knive, makers, hand sand. I too hand sand.

It is all about the control. Look at (Nick Wheeler Hand sanding knives 101)