One of the test for assurance of shading quickness of colored of printed calfskin is the crocking test. This test is utilized for the assurance of shading speed against rubbing, either under dry or wet condition. In this test a moving metal finger of determined shape and size rubs against the test examples under a settled load. The measure of shading lost by the test example and the measure of shading exchanged to a bit of abradant Leather settled over the base of the moving finger are reviewed with the assistance of standard dark scales to assess the shading speed of the example under test rubbing.
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