J.m. Huber Corporation

Kathleen S Pike

John A Kostinko

James E Sumpter

Calcium phosphate colorants are provided that comprise calcium phosphate particles, a dye, and aluminum hydroxide and which are resistant to dye migration and suitable for use in food, drugs and cosmetics. The calcium phosphate particles are coated with a dye and the dye is fixed to the particles by the aluminum hydroxide. Also provided is a method for making a calcium phosphate colorant in which aluminum hydroxide is mixed with a calcium phosphate slurry to deposit aluminum hydroxide onto the calcium phosphate particles contained within the slurry.

Calcium phosphate colorants and method for making same

There is provided a method of adhering dye to a silica. The method comprises providing a silica slurry which includes a plurality of silica particles, depositing alum in the pores of the silica particles, reacting a base with the alum to convert the alum into aluminum hydroxide resulting in treated silica particles. The treated silica particles are then filtered and washed. Thereafter, a dye is mixed with the treated silica particles. The resultant dyed silica product is resistant to dye migration.

Color containing silica resistant to dye migration and method of making

A dentifrice containing a dye absorbing silica which imparts a speckled appearance in toothpaste or gel formulations. The dye absorbing silica comprises silica granules which have a linseed oil absorption of at least about 150 cc/100 g, an average particle size of about 400 .mu.m to about 600 .mu.m, an attrition value of less than 30%, and a pH of about 6 to about 8.

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Bel Air, MD, United States of America

Kathleen S Pike