OldPerry
Forum Replies Created
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My question too@PhilGeis.
What would not qualify as animal, plant or mineral?In my opinion everything is naturally derived because anything that is not from nature is supernatural.But if you restrict yourself to only molecules that exist in nature then an olefin sulfonate would not in any stretch of the imagination be natural.
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Glycerin is not a preservative.
It can be used to reduce water activity, but this does not make it a preservative. -
Yes, there is no good reason to homogenize SLS/SLES
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Just use glycerin & maybe a cellulose
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No brand of shampoo or conditioner is going to deliver nutrients to the follicles. It’s just a BS marketing story.
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@rosa - a few things
1. it takes very little colorant to make a liquid blue. .001% would likely be enough
2. no it is not legal to list solution concentrations higher on the ingredient list but ignorance of the rules or outright ignoring rules is often seen by smaller companies in the industry
3. no there is no such reliable list of effective concentrations. That’s because there isn’t definitive proof that active ingredients actually work. Companies that conduct such research have motivated reasons for exaggerating effects so the research is unreliable.
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I was most surprised to learn about claims ingredients. For example Brands talk about the Aloe or ceramides in their products but they know that it’s petrolatum & mineral oil actually providing the benefits.
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The standard is that you use enough that you’re able to claim it on the packaging but not so much that it cuts into profits. Consumers are unlikely to notice any difference so there is a tendency to use as little as necessary.
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@Paprik - “The “problem” with hair is, the more you wash it, the more is produces sebum. Same with skin.”
What has convinced you this is true? I did a little searching on Google Scholar but couldn’t find any studies supporting this claim.
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There is not really an equation you can use. But what you can do is to use the principle of “q.s.”
So, in your formula your active would be used at 2%. Say you have water at 97% and then your acid would be listed as q.s.
You would figure out over time how much acid is really needed to get the pH that you desire. Sometimes it might be 0.5% which would bring your total formula to 99.5% (97 + 2 + .5). In this case you would also top it off with 0.5% water to get to 100%.
There might be another case where you need 0.8% acid to bring it to your desired pH. Then your formula adds to 99.8% and you’d have to add 0.2% water to get everything to even out.
As long as you leave a volume for the acid suitable for adjustments (1% should be enough) then you can always keep your active ingredient to it’s desired %
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“would the micelle shape be different between 6% and 12% surfactant“
I don’t know. You would have to do a phase diagram to determine the substructure of the solution.“Can you explain it a bit more“
All I was trying to point out is that when you put solution B in your hand and mix it with water, it will take some time to dilute completely so that it matches the concentration of A.Suppose you took a sample of B, put it in your hand, poured water on it. The water would initially be on top of the sample and none of the concentrations will change except at the very surface of the sample. The middle of the sample will still have the same concentration as when it started. Only as the water migrates through the sample will the concentrations start to match B with A. But if you don’t give it enough time to dilute, the concentration across the sample will be inconsistent. It is this inconsistency that might matter (or maybe not).
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Welcome to the forum Nirmala!
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1. Different
2. In theory, yes. In practice maybe not because B might never fully hydrate to reach those half concentrations. -
@Abdullah - one of the problems with phenoxyethanol is the odor.
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Yes and No. Some ingredients with the same characteristics are swappable, others are not. It just depends on what ingredient you’re talking about and what the application is.
For example, Sodium Lauryl Sulfate is a surfactant and so it Cetrimonium Chloride. But they are not swappable in a formula.
But soybean oil could probably be swapped with sunflower seed oil. It just depends.
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I imagine any styling polymer will potentially work. PVP perhaps? This is where you’ll have to experiment. It depends on what characteristics you are going for (hold, feel, manageability, etc).
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That’s an ingredient produced by Noureon.
https://www.dropbox.com/s/qielz3na0dc0kle/pds-BALANCE-47-na-en-201903191646.pdf?dl=0 -
We had a discussion here. https://chemistscorner.com/cosmeticsciencetalk/discussion/641/laboratory-set-up-equipment-list#latest
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@Abdullah - it moisturizes the skin which helps “plump up” the skin, keeps in some moisture and makes the wrinkles look less apparent.
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0.5 ounces/unit x 3000 units = 1500 ounces
specific gravity is more related to whether you can fill a container of some certain size with a volume of product. 0.5 ounces of feathers is going to take up a lot more room than 0.5 ounces of hand cream.
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I think the no answer means no one has heard of it. Perhaps you’re thinking of disodium lauryl sulfosuccinate?
but no you couldn’t make the molecule just by mixing benzene without a reactor
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Also, you might try adding it to water with a temperature lower than room temp.
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Raw material names and structures. Have you read this? https://en.wikipedia.org/wiki/CAS_Registry_Number
It is not terribly helpful for the cosmetic industry though since CAS doesn’t say much about what an ingredient does & it doesn’t coincide exactly with INCI names of ingredients.
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Excellent!