OldPerry
Forum Replies Created
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That could work for preservation but it depends on many factors (ingredients, manufacturing conditions, etc). The only way you know for sure is to do testing. You can’t simply look at a formula on paper and know for certain that the preservative system will work.
*Edit - I should add that 1.5% DMDM Hydantoin is a very high amount and probably excessive. We used 0.2% for such products. But the amount to use depends on many factors as noted above.
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@Microformulation - yes, I agree that a big problem with no solution at the moment is ingredients that are shown to do something when topically applied but are not legal if they actually worked. Lack of regulation in this area hurts the advancement of cosmetic science.
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This may be helpful.
https://chemistscorner.com/where-to-find-free-cosmetic-formulas/
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You could also try adding a silicone like Dimethicone or Amodimethicone
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“I usually add the oil phase into the water phase after heating”
then…
“I decided to try out a small by adding the oil phase to the water phase“
How are these different?
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Hello - Thanks for the question.
Perms typically contain oils for hair conditioning and they contain fragrances so you’ll probably be ok adding a small amount of an essential oil to the mixture. I’m not sure it will help with the smell but it’s unlikely to hurt the results of the perm.
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I never really worked on color cosmetics but we always did color matching of shampoos / lotions / conditioners based on retain samples.
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You might try our course. https://chemistscorner.com/formulating-cosmetics
You also should get our free report http://startacosmeticline.com
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This has been discussed previously.
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@Bill_Toge - The folks in New York and California do even better. Of course, it costs more to live there.
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@em88 - lol! When I started as a formulator back in 1992 in Chicago, my salary was $26,000 a year. 17 years later, my last year working for the same corporation, I was making ~$120,000 plus a number of incentive bonuses. I think the head of R&D at the time was making around $400,000 plus bonuses.
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You just have to figure out how much time the project will take and how much money you want to make an hour.
If you have a $100,000 a year job, that means you make $50 and hour. (2000 working hours in a year)
But you should also figure in benefits like health insurance, 401K program etc. If you worked at a job and made $100,000 a year your real compensation is probably more like $130,000 a year which is $65 an hour. Then there are business expenses like rent, equipment, insurance which could add another $10,000. So, if you see yourself as a person who should make $100,000 a year, you would charge $75 an hour.
Of course, some consultants would just double this figuring they won’t work an entire 2000 hours in the year.
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I agree. Run a salt curve analysis.
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Yes, small amounts of ingredients can cause significant colors.
You could easily test this. Make a batch with only Ascorbic Acid and one with only Ferulic acid. If there is no color, then you know the problem.
Although, it sounds like you already did a version of this by testing other thickeners. Since the other thickeners also changed color (albeit a lighter color) you know there is at least some reaction going on.
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@aperson - all you say is correct. Knockout experiments have limitations. But the value they provide vs the amount of work required is unmatched by other experimental approaches. Especially, if you lack significant experience in a formulation type.
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Yes, don’t count on LOIs to be correct.
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You might get other answers on different forums but none of those responses will be science-based.
That’s because I don’t think a question like this has been scientifically studied. And it certainly hasn’t been studied on your own skin (or whoever you’re talking about).
This is the kind of thing which would best involve a personal experiment.
Try procedure A for one month, then evaluate your skin.
Try procedure B for one month, then evaluate your skin.Through trial and error you could probably find what works best for you.
Of course, you should also realize that just because it works for you doesn’t mean your experience would be generally applicable to everyone else.
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There is no science-based evidence that alcohol will cause drying on the scalp.
But you could also add more water to the system which would increase set time.
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Hello - Your question is a bit too vague and not specific enough which is why many people haven’t answered. Plus, you’ve got to give it some time. Most of the people on this forum are active during the week. There is no as much activity on the weekend.
For your question, yes you can probably substitute vegetable oil for macadamia oil, although Olive Oil would be a much better match.
Gum arabic may or may not work as a substitute for Xanthan gum. It depends on your system. Certainly, you could try it.
Use instead of dimethicone? What are you using the dimethicone for?
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I agree with @DiamondD. I’d also suggest you experiment to find out whether you really can tell a difference. From a scientific standpoint, there is no reason there should be much difference. It’s more likely confirmation bias. But it would be something worth testing in a more controlled way.
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A blend of DMDM Hydantoin and Methylparaben would work well for most hair conditioners.
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I wrote this a little while ago.
https://chemistscorner.com/how-to-get-the-most-out-of-a-cosmetic-industry-meeting-or-trade-show/I would add, bring lots of business cards to hand out. All it needs on there is your name and contact information.
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@Microformulation - to be fair, sodium ascorbyl phosphate is an organic molecule containing numerous C-H bonds. Of course, organic chemistry has little to do with the way “organic” is used in the marketplace.
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You can verify what is causing the stinging by doing a partial knockout experiment.
Aqua (Water) 93.10
Ultrez 10 (carbomer) 0.30
Natcide (Parfum —>used as a preservative) 0.70Make 3 batches where in each one you leave out one of the ingredients below. Replace the missing volume with water. Then test it and see which formula doesn’t have stinging. If you leave an ingredient out and there is no stinging, you know that was the culprit.
Biolin (Inulin Alpha-glucan oligosaccharide) 5.00
Witch hazel 0.30
Sodium Hydroxide (10% Solution)