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Lemur, buy a sheet of cheap foam core poster board from a dollar store. Not the good board with the shiny smooth paper.

The cheap one has a construction paper finish and cost a dollar for a 30 by...

Chrome Oxide on paper works well, not all Chrome Oxide works well on razors though, it is grit size dependent.

Good Chrome Oxide will polish on almost anything except waffles… paper, wood, cloth,...