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In order to determine the control fastness test, test piece of cloth and discoloration or dirty degree.
Use note:
1, Keep the ash card clean.
2, Often check whether there is a fingerprint on the grey card.
3, If it is found that the mark has been disturbed by the rating, the grey card must be replaced.
4, Try to avoid the mechanical damage caused by touch.
5, If the damage to the machine is disturbed by mechanical damage, it should be replaced.
6, After the ash card is used up, the card is loaded into the card.

Product classification:
AATCC standard grey card / discoloration - United States
AATCC standard grey card / stain - United States
AATCC standard grey card / discoloration - Homemade
AATCC standard grey card / stain - Homemade
ISO standard grey card / discoloration - UK
ISO standard grey card / stain - UK
JIS standard grey card / discoloration - Japan
JIS standard grey card / stain - Japan
GB250 standard grey card / discoloration - Homemade
GB251 standard grey card / stain - Homemade