I have a new client coming in Friday for a root retouch. She mentioned she used a high-lift red the last time she colored her hair. Since I already have the Matrix Red Booster on hand, I wanted to review some formulation details for it. My other thought is Schwarzkopf Igora Royal Fashion Lights (L-88 or L-89), depending on the tone of red she's aiming for. I'm doing a consultation with her tomorrow to evaluate her hair in person and to further discuss the options.