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Lotion Turning Yellow on Stability
Hi Guys
I really learnt a lot from here reading post and all. I would really need some help with my lotion.
I formulated this lotion which my boss finally liked.
After keeping it on stability at 50 degrees Celsius it turned Bright yellow from white. The ingredients I added in it are as follows
Distilled water 76.3
Glycerin 3
Xanthan Gum 0.3
Spemax Zen 0.5
Olivem 1000 2.0
Arlacel 165 1.0
Crodamol SS 0.5
Sensolene Care DD 1.5
Capuacu Butter 1.0
Tucuma Seed butter 2.0
E gas 1.5
Cetyl Alcohol 2.00
Jojoba oil 2.0
Macademia Oil 1.0
Vit E 0.10
Gransil Si WHA 3.00
Euxyl 9010 0.8
Sharomix A24As per me I fell like it could be the Vit E And Xanthan Gum. I also think the Jojoba oil but that ingredient my boss does like I dont mind substituting it I was think to CAPRYLIC CAPRIC TRIGLYCERIDES or COCONUT ALKANES (AND) COCO-CAPRYLATE/CAPRATE.
I need this to pass the stability testing soon. Any help in formulating will do .
Thank you in advance! -
24 Replies
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Any observation for 40C? 50C is pretty high.
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Same Result
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INCI NAMES
Crodamol SS is Cetyl Esters
Sensolene Care DD is Lauryl Olivate
E gas is Glycol Stearate, Stearamide AMP
Gransil Si WHA is Cyclopentasiloxane (and) Aqua (and) Dimethicone (and) Polysilicone-11 (and) Butylene Glycol (and) Sodium Hyaluronate (and) Decyl Glucoside
Sharomix A24 is Methylpropanediol (and) Caprylyl Glycol (and) Polyquaternium-80 (and) Didecyldimonium Chloride. Sharomix™ AM 24 by Sharon Laboratories is an odor- & color-free preservative. -
@Iwana You might want to chek this thread about a similar issue (https://chemistscorner.com/cosmeticsciencetalk/discussion/2061/discoloration-during-stability-test).
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Yes i did read that one it did say that the shea butter , sorbitol or haluronic acid could be the cause .
I am think one of my butters only maybe. -
Thank you so much for you help though
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What I would suggest you do is a knockout experiment.
https://chemistscorner.com/do-you-know-the-fastest-way-to-become-an-expert-cosmetic-formulatorNow, in your formula you wouldn’t have to make a separate batch to knock out every ingredient. I would say you could test
Arlacel 165 1.0
Crodamol SS 0.5
Sensolene Care DD 1.5
Capuacu Butter 1.0
Tucuma Seed butter 2.0
E gas 1.5
Jojoba oil 2.0
Macademia Oil 1.0
Gransil Si WHA 3.00So make a series of batches where you don’t add one of those ingredients. (replace the missing volume with water). Then see which one turns brown. The batch that doesn’t turn brown is the ingredient that is causing the problem.
Knockout Experiments for Cosmetics - The Fastest Way to Become an Expert Formulator
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Yes i going to be doing that today itself and put them all on stability to check which one is the culprit.
Thank you so much -
Once you do your knockouts….please post back…who was the culprit.
Aloha.
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my prime suspect is stearamide AMP - amines are terrible for discolouring both over time and at high temperatures
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@Bill_Toge My first thought was also AMP but then I realised that it’s in amide bound form and should be pretty stable… should at least in theory.@Iwana Do you have a picture of the yellow to get an idea of how yellow you’re talking?There’s nothing in your product which should turn yellow but should and does are two different things when it comes to more or less natural multicomponent mixtures meeting water, oxygen, heat, and time. -
Interesting, it’s bright yellow, I have only seen pale yellow or bronw-ish of source.
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@Pharma - When working with raw materials, it’s difficult to know what the chemical makeup actually is. Just because a supplier calls something one thing doesn’t mean that is what they are actually delivering. This is why I encourage experiments like knockouts to figure out what’s going on.
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I am almost positive it is the the butters you have in the formula. Those particular rainforest butters are extremely susceptible to oxidation and will turn your formula yellow over time, even at RT. In a 50C oven, obviously that will be accelerated. You may even notice an odor change.
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I threw out the batch that turned yellow but to be more specific it was a bright yellow color.
I am not sure if the smell was bad at least to me i felt it was the same. The butter smell was strong little more than before.
Yes ill will let you’ll know who the culprit ! I put the batches in the oven yesterday. -
At 8% butter my emulsion was yellow but at 1% it was white.
Also emulsion with mustard oil was yellow -
So my lotion batches are still on Stability at 50degrees C and non of them have turned yellow this time now.
I thought most would and only one would not.
I have no clue who the culprit is now !
I guess Ill make the whole batch together again and see what happens. -
Guys I was wondering why but there was a lot of water like on the top of all the jars.
It this correct after putting on stability at 50C for one month? -
As far as water goes, yes that is probably condensation. 50C for 1 month is pretty extreme testing. Typically, 45C is the max used for that long of a time.
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So has it passed Stability?
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Well, only you or your company can decide whether something passes stability testing or not.
Generally, a product is considered stable if it maintains characteristics within a specified range for that characteristic. For example, if the pH range of a product is set at 4.5 - 5.5, a product can be considered stable if the pH remains within that range for the length of time of the stability test.
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Normally In lotion Formulation do the lotion become watery and like this. And still pass ?
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No, you set a viscosity specification. Then you measure the viscosity over time. Ideally, the viscosity will remain unchanged (or changed within specific limits). If it falls outside the limits then the product is unstable.
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Iwana said:Normally In lotion Formulation do the lotion become watery and like this. And still pass ?
Can you clarify….watery?
Did all contents become watery….or you got something that looked like sweat…or condensation on the top of the product…or sides of the bottle, but the balance of the product maintained viscosity?
Maybe a picture would help.
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