Fastness

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The property of resistance to an agency named (e.g., washing, light, rubbing, crocking, gas-fumes).

Note : On the standard scale, five grades are usually recognized, from 5, signifying unaffected, to 1, grossly changed. For lightfastness, eight grades are used, 8 representing the highest degree of fastness

Textile Resource (http://www.textile.org.uk)

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