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Form 21B is a black and white sealed opacity-display chart. The top most area is white, then black and then strip with overall dimensions of 7-5/8 x 11-3/8 in (194 x 289 mm).
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Form 21B is a black and white sealed opacity-display chart. The top most area is white, then black and then strip with overall dimensions of 7-5/8 x 11-3/8 in (194 x 289 mm).