Discoloration of Toner

Our existing toner, in which it was developed by a third party, develops a discoloration overtime. The product was already here when I got deployed in the company. As I've checked the pH of the toner, it was 2.89! Shelf life is 2 years. 

Water - 61.70g
Ethanol - 11.25g
Glycerin - 1.13g
Eumulgin - 1.5g
Fragrance - 0.3g
Vitamin A - 0.113g
Radianskin - 0.098g
Malus Domestica - 0.08g
EDTA - 0.038g
Ment - 0.023g


I also noticed that there is no preservative present in the formula. Well, can EDTA sustain with its amount ability to preserve its shelf life? 

Comments

  • Radianskin is Hydroxyphenoxy Propionic Acid and EUMULGIN is PPG-1-PEG-9 Lauryl Glycol Ether.
  • ShengSheng Member
    I encountered this discoloration when I used Radianskin on our spot correcting cream. It turned to "brownish cream" after few months. Try to do elimination process because when we remove this active on our formulation, it did not discolor.
  • Sheng said:
    I encountered this discoloration when I used Radianskin on our spot correcting cream. It turned to "brownish cream" after few months. Try to do elimination process because when we remove this active on our formulation, it did not discolor.
    Thank you, @Sheng. I'll to eliminate. Does the pH affect microbial activity? Does it make it more rancid? 
  • I mean the oils. 

  • ozgirlozgirl Member, PCF student
    The low pH in combination with the moderate amount of ethanol is probably what is currently preserving your formula. If you increase the pH I would recommend adding a preservative.
  • ozgirl said:
    The low pH in combination with the moderate amount of ethanol is probably what is currently preserving your formula. If you increase the pH I would recommend adding a preservative.
    That is true. Low pH products, as well as high pH products(above 9) do not need any preservatives. 
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