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  Colour stability problem

  Posted by Anonymous on August 11, 2014 at 8:59 am

  Hi everyone!!

  I have a problem with the stability of colour in cold process soap, melt & pour and in transparent body shampoo. 

  In CP & MP, the colour fade after a week. Our supplier suggest to put benzophenone 4 to solve this problem but then the colour change.

  Example:

  Process: Melt & Pour

  Colour put in soap: Red

  Result: Colour change to orange

  I wonder, why the colour fade at first (CP & MP) and when put benzophenone 4, the colour change.

  While in transparent body shampoo, the colour not stable.

  Looking forward for everyone respond!

  Bill_Toge replied 10 years, 4 months ago 1 Member · 1 Reply
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• 

  Bill_Toge

  Member

  August 11, 2014 at 4:24 pm

  what red dye are you using? some dyes are notoriously unstable towards daylight

  also, benzophenone-4 goes bright yellow in alkaline formulas (e.g. bar soaps), hence the colour change

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