The resistance of the surface finish and colour of leather to action of heating such as may occur when shoes are flamed, hot blasted, ironed, or subjected to other shoe making operations involving contact with hot tools, machine parts, air and gases, is determined by pressing a piece of finished leather under a copper bit maintained at different elevated temperatures for a period of five seconds under a specified load and evaluating the change in colour produced with the help standard grey scale for change in colour.
Society of Leather Trades Chemists
IS 6191 - 1971
Methods of Micro-biological, Colour Fastness, and Microscopical Tests for Leather
Determination of Fastness to Heat of Coloured Leather
Range of force measurement
Tensile Testing Machine
Colour Fastness Testers