Home Cosmetic Science Talk Formulating Color and makeup Color-Changing D&C Red No. 21 and 27

  • Color-Changing D&C Red No. 21 and 27

    Posted by Marsupilami on January 30, 2021 at 5:13 am

    Hi All
    I am trying to identify which group/class of this (color-changing) dye D&C Red No. 21 and 27 ( CI45380:2 and CI45410:1 respectively).

    They are solvent dye. To narrow it down further, are they an acid dye or basic dye?
    Appreciate if anyone with more experience can help clarify this.

    MelindaNicole replied 1 year, 2 months ago 2 Members · 1 Reply
  • 1 Reply
  • MelindaNicole

    March 28, 2023 at 10:35 pm

    The pH color changing is due to bromo acid powder dye that is water insoluble. I bought a couple this past summer but haven’t had a chance to play with them yet.

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