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  Zinc oxide & rosemary

  Posted by Anonymous on April 26, 2017 at 6:30 am

  Hi All,
  I need help please!

  If I use the zinc oxide and rosemary CO2 together, the product’s color change to purple ( at 5,5 ph is dark purple). This phenomenon occurs is not only in the emulsified product but also in water- free ( balsam) Can you help why make it?
  thank you!

  DRBOB@VERDIENT.BIZ replied 7 years, 7 months ago 3 Members · 3 Replies
• 3 Replies

• 

  johnb

  Member

  April 26, 2017 at 7:09 am

  As an initial thought, how pure is the zinc oxide?
  Rosemary extracts are phenolic and phenols characteristically react with iron to produce an intense red or purple colour. As iron is a common contaminant of ZnO it could be that reaction.

• 

  Bobzchemist

  Member

  April 26, 2017 at 1:50 pm

  How pH stable is the color?

• 

  DRBOB@VERDIENT.BIZ

  Member

  April 27, 2017 at 2:29 pm

  Redox-at low PH zinc ions are likely reacting with Fe ions to discolor.I would first raise PH to 7 and observe color.

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