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TPT is the "thumb pad test".

The black marker is used when sharpening, in combination with the TNT (thumb nail test). Helps you make sure the edge is really set all along it's entire length. Also...

Alcohol 91% or better, mineral oil (or camellia, aka tea seed cooking oil), newspaper for edge drying and touch-up, styptic pencil, a black marker, and a plastic pencil box with a small packet of...