SummaryPaper coated with peanut protein adhesive and mineral pigments gives high wax pick tests. Critical factors affecting the wax pick value are the type of protein, pigment, and dispersing agent, pH, protein‐pigment ratio, and total solids content of the slip. When neutralized protein is used as the adhesive, coating slips containing 40% solids may be prepared with pH values as low as 6.3; and when these slips are applied to raw stock, the coating has wax pick values satisfactory for many printing operations. Over a pH range of 8 to 12, coatings prepared from unwashed protein give high wax pick values, whereas those prepared with water‐washed protein give slightly lower values.
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