It is imported from James h.heal in the UK and is used to evaluate the discoloration / fading of samples in color fastness test. It is also called ISO standard discoloration gray scale. Designated for use in most ISO color fastness standards. ⏹ At Adidas ft-05, ft-07, ft-08, ft-11, fgt-01, fgt-04, fgt-07 Standards are widely used.