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Product Specifications: Every pack 8sheet 1-8level
Details:

NO.1~ NO.8Series Blue Wool Fabrics are wool fabrics that have been dyed with special blue dyes to provide blue wool from a very low light fastness to a very high light fastness range.

They form from 1To 8Of the ordinal series ,1Represents the lowest light fastness to 8Represents the highest light fastness.

This product can be used to measure the color change of the grading scale to the fabric classification, and the use of performance-related, they are in the ISO 105 B Series of tests used.
Applicable standards: BS 1006, ISO 105, AATCC16, M & S C9A
Product Size: 240 mm (9.5inch )Respectively150 mm (6inch)