I recently put forward my toner for stability test, which failed. The colour changed from pale yellow to deep golden at week 8 during the 45C test but nothing else changed, the ph 6.5, so I am assuming that the failure was the Vit C (Sodium Asorbyl Phosphate) oxidising.
This was my formula, can anyone suggest what I could add to stabilise the oxididation.
Water to 100%
Peg 40 Hydrolysed Castor Oil 2%
Hydroxy-propyltrimomium honey 3%
Sodium Asorbyl Phospate 1.5%
Phenoxyethanol & Ethlhexylglycerin 1%
Aqua, Glycerin, Cucumber extract 0.7%
Aqua, Glycerin Pommegranate Fruit Extract 0.7%
Citric acid 0.02%
Aloe Vera Powder extract 0.15
Rose Geranium 0.1%
Vitamin E 0.1%
Sweet Orange 0.1%