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Colour fastness

Colour fastness is a fabric’s resistance to losing or transferring colour through washing, light, rubbing, perspiration or water, graded under the ISO 105 test series.

Also called: Color fastness · Colourfastness

Colour fastness tests show how well dyed or printed textiles keep their colour in use. The ISO 105 series covers the common cases: washing (ISO 105-C06), light (ISO 105-B02), rubbing or crocking (ISO 105-X12), perspiration (ISO 105-E04) and water (ISO 105-E01), among others. Results are given as grades — for most tests on a grey scale from 1 (poor) to 5 (excellent), for light fastness on the blue wool scale from 1 to 8.

For uniforms and field equipment, washing, light and rubbing fastness matter most, because colour loss also changes the appearance of camouflage patterns. A specification should name each test method and the minimum grade required.

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