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Color change in gel cleanser
Hello all,
I am formulating a “green/naturally derived” gel cleanser that has a blue/green tint from blue tansy. Over time we have noticed the color darkening to more of a brown. I know “natural” ingredients tend to change color over time but I wanted to ask the experts here to see if there is anything glaring in the INCI that may be interacting. Wakame, Licorice root, White Tea, and Sage extracts are all 1% and under, and the essential oils are all below 0.07%.
Below is the INCI:
Purified Water / Eau, Sodium Cocoamphoacetate, Coco Glucoside, Lauryl Glucoside, Glycerin, Sodium Cocoyl Glutamate, Sodium Lauryl Glucose Carboxylate, Caprylyl/Capryl Glucoside, Glyceryl Oleate, Sodium Citrate, Sodium Benzoate, Gluconolactone, Undaria Pinnatifida (Wakame) Cell Culture Extract, Oryza Sativa (Rice) Extract, Salvia Officinalis (Sage) Leaf Extract, Glycyrrhiza Glabra (Licorice) Root Extract, Camellia Sinensis (White Tea) Leaf Extract, Sodium Phytate, Citrus Nobilis (Mandarin) Peel Oil, Melaleuca Alternifolia (Tea Tree) Leaf Oil, Tanacetum Annuum (Blue Tansy) Flower Oil, Boswellia Carterii (Frankincense) Oil, Citrus Aurantium Dulcis (Blood Orange) Peel Oil
Thanks for your input!
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1 Reply
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Maybe a couple things to look at:
Many natural colorants are pH dependent. You have included an ingredient that will change pH until it is exhaused….meaning you have induced your own pH drift. Remove that and see it if persists.
Many natural colorants will oxidize with time (and not that much is required). Consider antioxidants. Memba, they only work in the phase they are soluble in, so you might need both a water and lipid soluble one.
Consider packaging as well….often light is your enemy in a situation like this.
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