Product Name: NO.1 ~ NO.8 series blue wool fabric
Details: NO.1 ~ NO.8 series of blue wool fabric is a special blue dyeing wool fabric, light fastness from very low to very high light fastness blue wool. They form a series of ordinal numbers from 1 to 8, and 1 represent the lowest light fastness to 8 to represent the highest light fastness. This product can be used to measure the color change of the gray scale to classify the fabric and to be associated with the performance of the use. They are used in the ISO 105 B series test.
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