US Patent No. 10,058,494 B2; L’Oréal, Paris, has been awarded a US patent for its method to alter hair color. The method entails mixing a hair treatment composition and a color-altering composition; applying the mixtures to the hair; and applying a conditioning composition. The treatment composition is comprised of monoethanolamine; at least one carboxylic acid chosen from maleic acid and salts thereof; at least one solvent chosen from water, cosmetically-acceptable organic solvents, and comb...