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That's right, I thing it depends partly on the hardness of the particles, althought I read somewhere that Croox is equivalent to corundum, so a big 9 on the Moh scale (diamond is at 10, hardest...

Woah ! What a huge load of questions !

can you find paddle strops with a linen side? : never seen one of them.
What is appropriate use for pastes? : stropping after honing, touching up an edge....