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GREy scale
Description and Content: Scale for visual assessing changes in colour of the material or staining during colour fastness testing, according to ISO 105-A02 and ISO 105-A03, respectively
Used in test methods: UNE 59 220, UNE 59 223, UNE 59 226, UNE 59 242, UNE 59 250...
Technical specifications:
Scale composed of five standard pairs of matt grey bands
Visual colour difference or contrast corresponding to grades from 5 to 1
