Color Change In Sugar Scrub

Hi All,

I was wondering if someone could give me some insight.

I have a sugar body scrub made vegetable glycerin, propylene glycol as the main base and notice that the colors darken over time. Can someone explain to me why this is happening? And if there's a method to prevent it or should I just accept that?

Thank you all,

Doaner

Comments

  • gld010gld010 Member
    We need to see a list of full ingredients. It could be mold on the sugar, it could be oxidization, who knows.
  • Sucrose, Propylene Glycol, Glycerin, Polyacrylamide and C13-14 Isoparaffin and Laureth-7, Benzyl Alcohol, Dehydroacetic Acid, Fragrance, FD&C Blue 1, FD&C Red 33

    Although, a slightly different formula with no PG has been use prior with the same issue. 
  • BelassiBelassi Member, PCF student
    Dehydroacetic acid!  :s
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • What does that mean, @Belassi ? Just so you know... the other formulation we use doesn't use Benzyl Alcohol / Dehydroacetic Acid, it has DMDM in there. 
  • BelassiBelassi Member, PCF student
    edited June 2018
    Because that preservative is absolute crap. EASILY ruins products. I've tested it.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • Well that's encouraging, but I appreciate the feedback. It's the customers formulation and they wanted to use that when we duplicated their reference. Any other suggestions on why that color is darkening since we're also seeing that in different (but similar) formulations.
  • BelassiBelassi Member, PCF student
    It's up to you how much time you want to waste.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • I certainly don't want to waste time. I'm looking for different scenarios as to why this is occurring and I'm not convinced the preservative is the culprit. Thanks anyways for the input, I will definitely test this theory out @Belassi and see how we can improve our products. 
  • SibechSibech Member, Professional Chemist
    edited June 2018
    If in doubt, knock it out!

    Do multiple variations, removing an ingredient from each to see which of them that does not discolor - by the looks you have no water added, and if kept dry you shouldn’t worry about the preservatives for the knock-out

    Another thing, approximately how long does it take for the color to change significantly? Days, weeks, months?
    Dabbling Formulator — Qualified Cosmetic Safety Assessor — experienced in claim substantiation & EU regulatory affairs.
  • Hi @Sibech! Yes, that's the only way. I wonder if it's just the color not stable, which have a light fastness of 4 (that's medium from this chart I have). 

    It takes about 30-90 day to take notice. From left to right days in julien are:

    039 - 134 - 166

  • SibechSibech Member, Professional Chemist
    @doaner12, Does it get darker before going bright or is it just the light in the image?

    FD&C Blue #1 (Brilliant Blue FCF) isn't particularly light stable but much more stable in anhydrous formulations than aqueous.
    Have you considered using lakes instead of the dyes?
    Dabbling Formulator — Qualified Cosmetic Safety Assessor — experienced in claim substantiation & EU regulatory affairs.
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