Home Cosmetic Science Talk Formulating Difficulties in working with dispersed pigments

  • Difficulties in working with dispersed pigments

    Posted by Lab on August 29, 2023 at 9:19 am

    Hey guys!

    We’re working on some make-up formulations and found it difficult to incorporate pigments (the supplier sent them previously dispersed)

    We tried to incorporate it into the oily phase, but the result wasn’t good… the pigment doesn’t seem to be completely incorporated and several “dots” and traces of color remains (we heat the oily phase separately from the aqueous one, mix the pigment in the oily phase and, when both are at 75 ºC, we pour one over the other, proceeding with stirring at 500-800 RPM)

    We also tried to incorporate it into the cooling process and, although the color was more beautiful, we still noticed the dots (in this case, we make the entire emulsion, heating the oil and aqueous phases to 75 ºC and then stirring at 800 RPM. When it cools down, we add the dispersed pigments and stir up to 1000 RPM)

    We’ve already tested it on a serum (fluid, low oily phase, low coverage) and on a sunscreen (more viscous, higher oily phase, medium coverage), without success

    Is there any technique that facilitates the incorporation of these dispersed pigments? It’s our first time working with this type of formulation

    Thank you for your time (:

    gordof replied 3 weeks, 4 days ago 3 Members · 2 Replies
  • 2 Replies
  • zoya

    Member
    August 29, 2023 at 2:14 pm

    Hi Lab,

    You may find this useful:

    https://www.ulprospector.com/knowledge/6458/pc-settle-down-factors-that-influence-pigment-settling-and-stability/

    Good luck! 🙂

  • gordof

    Member
    August 30, 2023 at 3:48 am

    Hi

    Normally to make homogeneous pigmented products you either need a very good homogenizer ) on a high setting (laboratory 500 g 20 min Homgenization with 10000 to 13000 rpm or a Roller System with several Roles wear the material is rinsed over several times and the Distance between the roles gets smaller and smaller (Colourcosmetic Production is normally done that way).

    There is although the Possibility to use Coted Pigments which go easily into the oil phase. Normally the Pigments (iron Oxides) are not water or oil loving so they tend to stick together and build dots. For example, SENSIENT BEAUTY has several different coated pigments for the water or oil phase depending on what your Formulation is ( W/O O/W).

    hope that helps

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