GB/T 251 Grey Scale for Assessing Staining
GB/T 251 Grey Scale for assessing staining.
The grey scale is divided into five levels includes nine grades according to distinguishable chromatic aberration between each group of the gray scale.
Grey scale comes with a cover box with three rectangular holes, the first one for the evaluation of multi-fiber staining, the second for the evaluation of crocking staining, the third for the evaluation of general staining.
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