The exposure of the specimen and the LFS is continued until the contrast between the exposed and the unexposed portions of the specimen or the LFS no. Valid!from:!February,!2004! Part A11; Determination of colour fastness grading by … The colour change scale consists of nine pairs of grey coloured chips, from grades 1 to 5 (with four half steps). DigiGrade can assess single or muliple samples and is fully compliant with BS EN ISO 105-A11:2012 Textiles - Tests for colour fastness. 5 on this scale mean no color change after exposure to all kinds of agitating agents, whereas grade 1 involves large amount of change in original color of clothing. Version:01! Color fastness generally refers to the strength of the textile fabric, footwear, leather against the influence of external factors. Color Fastness To Washing There are five (5) test methods of I.S.O.- Method i,ii,iii Same procedure but only temperature varies. Approvedby:Campbell!Page,!Global!R&A! Grey scales can be used for assessing colour change and staining during colour fastness testing. The ability of fabrics to hold its original color is undoubtedly the most vital properties of textiles. There is also a standard scale to measure color fastness correctly, it ranges from 5 to 1. Color fastness to washing means, A specimen of the textile, in contact with one or two specified adjacent fabrics, is mechanically agitated under described conditions of time and temperature in a soap solution, then rinsed and dried. Responsible:!SabineDickhautHGüdemann,Global!R &A! Page2!of!16! 7 is equal to gray scale grade 4. When a change in color of the exposed portion of the specimen can just be perceived, equal to gray scale grade 4-5, the number of the light fastness standard showing a similar change is noted. Colour fastness is a term—used in the dyeing of textile materials—that characterizes a material's colour's resistance to fading or running. Colour fastness is the property of dyes and it is directly proportional to the binding force between photochromic dye and the fiber.