The stripes are numbered 1 to 6, representing uniform steps of increasing contrast.

The hiding power of the applied coatings is rated as the number of the darkest stripe that is completely (or almost completely) obscured, at a specified thickness or spread rate.

Form CU-1 is used for more practical large-area brush or roller applications as in ASTM D5150. Applications on Form 24B are made with a drawdown blade.