Titanium dioxide affect color

Hello everyone,
I am formulating a cheek tint cream using the color d&c I 27 ( color changing powder when exposed to moisture). A simple formula of bees wax, IPM, CCT, OZOKERITE Wax, carnuba wax. 
THE problem is I want to add titanium dioxide, but when added it cause the powder to color pink (changing) , zinc oxide causes that as well.
I need to add it, it helps the texture to be less greasy and gives it a creamy texture.
Plz, Can anyone explain this to me ? 

Comments

  • FekherFekher Member, Professional Chemist
    edited April 2019
    @Amira for better texture and less greassy effect you can use C12-15 alkylbenzoate and strach.
  • AmiraAmira Member
    @fekher thanks for ur reply
    What do u think of magnesium stearate instead of starch? 
    Also, octyl palmitate is the one that is available for me beside CCT ? 
  • FekherFekher Member, Professional Chemist
    edited April 2019
    @Amira from short researching your input can give slicky and emollient effect but i did not find that they reduce greasy effect just octyl palmitate can reduce greaseness
  • AmiraAmira Member
    @fekher I am trying to find the available at the market. I will look for those chemicals and I hope to reach to something. Thank you and I will update post. 
  • FekherFekher Member, Professional Chemist
    @Amira  increasing % of IPM can also reduce greasy effect . Waiting your sucees have nice Job.
  • AmiraAmira Member
    edited May 2019
    @fekher ;
    Thank you for ur support, I appreciate it  
  • FekherFekher Member, Professional Chemist
    @Amira you are welcome .
  • you can use starch, like: structure XL
  • TiO2 and ZnO both are opacifiers, and will always affect the final color by making it lighter and more opaque. 

    if you want a tint to be sheer, remove both opacifiers and use something like a starch, silica or other oil-absorbing powders.
  • The color change sounds like a pH issue. If you do use zinc, readjust your pH ? You can also use other light emollients like olive & jojoba esters, Shea ester. Besides TiO2 or zinc what about Tapioca, mica, talc?
    Dr. Catherine Pratt
    (B.Sc with HONS I , Ph.D Analytical/Organic Chem and Microbiology), Cosmetic Chemistry IPCS)
  • SpongeSponge Member
    You say the pigment (27) is color changing - what color is it starting as, and what color is it supposed to become upon application?
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