Leading colorists agree on three key pitfalls: 1. Women often see themselves as darker than they truly are, leading to incorrect shade choices; 2. They struggle to differentiate coloring techniques, causing disappointment (like selecting permanent oxidation color instead of highlights); 3. Failing to follow exposure times—either leaving the product on too long, which overloads pigments, or rinsing too soon for underwhelming results, particularly on white hair.
Not at all! "Legislation for hair coloring is extremely strict, banning dangerous products for both salon and home use," confirms Frédéric Mennetrier, colorist at Atelier Blanc and L’Oréal Professionnel expert. Ammonia draws the most criticism, yet it's naturally present in the body and rarely causes allergies. Its main issues? Scalp irritation and a strong odor. It opens the hair cuticle but won't damage strands if you avoid frequent coloring and respect timing. Monoethanolamine, its milder substitute, can be allergenic, as can color precursors. Prevention is simple: Test the formula on your skin 24 hours beforehand.
Insights from Frédéric Mennetrier (Atelier Blanc, L’Oréal Professionnel), Rodolphe Lombard (Couleur par Rodolphe), and David Merveille (Schwarzkopf consultant).
