U.S. Patent No. 7,458,992 B2: Wella AG, Darmstadt, Germany, has been awarded a U.S. patent covering a coated dye-containing pellet for coloring keratin fibers. It is comprised of a dye-containing pellet and a coating material that coats the dye-containing pellet. The dye-containing pellet contains a carrier material and from 0.1-70% by weight of at least one oxidation dye precursor, and at least one oxidation dye precursor is uniformly mixed in the carrier material.
Dye-Containing Pellets Patented by Wella AG
Published November 30, -0001
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