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I used to mix my own developer for color corrections, but a client in Seattle had a bad reaction.
For years I blended 20 and 30 volume to get a custom 25, thinking it gave more control on resistant gray. Last month a regular client's scalp got red and itchy after a root touch-up, and her dermatologist said the homemade mix was likely unstable. Has anyone else moved to pre-mixed formulas from the manufacturer for safety reasons?
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