Ball mill the masterbatch until desired pigment fineness. Carefully disperse the ball-milled masterbatch in the water in the proportion noted. Note: the paint has excellent stability, and after it has dried it can be rewet and reworked. If the masterbatch is to be stored more than a few days, anhydrous sodium tetraborate must be used. Hydrated borax will cause the masterbatch to ball up into a tough, rubbery mass. Also pigments containing antimony oxide will react with "Carbopol" resins and form an unusable, rubbery mass. Use pigments that are relatively inert.
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