Hair colour - Basic Red Dye issue

Unknown Member
Good morning,
I am working at the moment on the semi-permanent hair colour using Basic Red 76. Depending on the formulation, "red dots" appears into the product after a couple of days at RT and/or 4C or even sometimes after 24h. Under the microscope those red dots look like crystals. Did anyone encounter this type of formula incompatibility? I am trying to remove each ingredient one by one, but so far not much luck. Thank you!


  • Bill_TogeBill_Toge Member, Professional Chemist
    Basic Red 76 is poorly soluble in water; what else have you got in the formula?
    UK based formulation chemist. Strongest subjects: hair styling, hair bleaches, hair dyes (oxidative and non-oxidative) I know some stuff about: EU regulations, emulsions (O/W and W/O), toothpaste, mouthwash, shampoos, other toiletries
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