11.17.22
US Patent No. 11,497,698 B2 (Antonio Consoli, Massimo Fabbi, Katiuscia Grevalcuore, Emanuela Facchetti); Beauty & Business S.p.A., Milan, Italy, has been awarded a US patent for a hair coloring composition. It contains an alkalizing agent consisting of at least one amino acid with at least a pKa greater than 10; at least one oxidative dye comprising a primary dye and a coupler; and acetylaspartic acid or salts thereof. It does not contain ammonia and ethanolamine.