Agent, useful for coloring and/or brightening keratin fibers, comprises a heterocyclic ring and an aldehyde-group directly bound at the heterocyclic ring

摘要

Agent (A) for coloring and/or brightening keratin fibers comprises 0.1-20 (preferably 2.5-12.5) wt.% of at least a heterocyclic ring (optionally substituted with at least a nitrogen atom) and at least an aldehyde-group directly bound at the heterocyclic ring. An independent claim is included for a procedure for brightening of keratin fiber, preferably human hair comprising applying a pre-treating agent (M1) on the fiber, applying an agent (M2), where (M2) is applied before using a further agent (M3), washing (M2) after 5-30 minutes, and optionally applying a follow-up treating agent (M4) after the treatment and washing after an influential time of some minutes.