Brightness of clay and other mineral pigments (45/0 ...
· laboratories that used the Anglo type pulverizer, as specified in this method. All samples were anhydrous, spray dried kaolin clays and ranged in brightness from 86 to 91 percent (measured in accordance with TAPPI T 452). Five test determinations were made per sample. Samples A1, A2 and A3 were from the same batch of clay; samples B1, B2 and