Color change evaluation with gray sample card,International grey card

Introduction:

To evaluate discoloration in color fastness tests, graded 1-5 in half increments, packed in a package.This series of grey cards for the international general 5 - grade 9 - file specification type

Color change evaluation with gray sample card,International grey card

Precautions for use

1. Keep the gray card clean.

2. Always check whether there are finger marks on the gray card.

3. If the mark is found to have interfered with the rating, the gray card must be replaced.

4. Try to avoid mechanical damage caused by touch.

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

6. When the grey card is used up, put it into the sleeve.

Color change evaluation with gray sample card,International grey card