It is used to evaluate discoloration and staining in color fastness testing. It is divided into grades 1-5 in half-grade increments and is installed in a packaging sleeve. This series of gray cards is an internationally accepted 5-level and 9-level specification type. The gray scale of the gray card is made entirely of colorimetric data provided by ISO, AATCC, and GB, and is made through careful color matching. The colorimetric data of each level is measured using an imported high-precision spectrophotometer and calibrated using the Colorimetric Transfer 1 benchmark of the Chinese Academy of Metrology to ensure that its grayscale data is consistent with the international standards. The applicable fields adopt the colorimetric data standards specified by the international standard ISO, the American standard AATCC and our country's national standard GB to calibrate the gray card, so the color fastness grade evaluated using the gray card is consistent with the international standard. This gray card is suitable for textile color fastness rating in GB, ISO, AATCC, DIN, BS, JIS, EN standards.

Precautions for use

1. Keep the gray card clean.

2. Check the gray card frequently to see if there are fingerprints or other marks on it.

3. If it is found that the mark has interfered with the rating, the gray card must be replaced.

4. Try to avoid mechanical damage caused by touching.

5. If mechanical damage interferes with the rating, it should be replaced.

6. After using up the gray card, put it into the sleeve.

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