Just to follow up on this point - I had my first BB last May and have been getting them every 4 months or so. I decided to use a "regular" (IE with sulfates) shampoo for the last 2 weeks because I knew I had a BB appointment coming up and didn't want to keep using my expensive Morrocan Oil shampoo and conditioner..and I had a huge container of frederic fekkai color safe that I felt bad about throwing out. Holy moly - the BB (which usually lasts a long time for me) totally disappeared and now I am desperate for an appointment.
So, FYI - using a non-sulfate-free shampoo is just a terrible idea.
the Fekkai color safe isn't sulfate free? I thought most 'color safe' shampoos/conditioners are sulfate-free, since the sulfates break down color quickly, too.