Does your stylist use permanent or semi/demi-permanent? If permanent, I don't think it matters too much when you wash your hair. The developing agents will penetrate regardless - timing may be affected but I believe that's all.

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2b, fine strands, lots of them
CG: 21 Apr 08, Mod CG: 24 Aug 08
Clarify: Giovanni Root 66 shampoo
Co-wash: Aubrey organics tea tree conditioner
Cond: Rotating so many!
Products: KCKT, KCCC
DT: KPak