Carry out the test on a card with black and white or black and gray squares used to determine the covering power. The appropriate card to use depends on the color of the product being tested; it must be chosen according to the list given in the
CGSB 1-GP-71 METH 9.4-1974 history
1974CGSB 1-GP-71 METH 9.4-1974 Methodes D'Essai Des Peintures Et Pigments Caracteristiques D'Utilisation