gfeldman

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gfeldman
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  • As @Benz3ne said, a lot of TiO2 could outweigh the yellow. That said, I think the best approach is to swap out your deeply yellow ingredients (I'm guessing low quality oils) with clear (esters) or light yellow (better quality) ingredients. That wi…
  • A lot of people use QS for the volume of water, myself included. So if I write QS where the water is on the formula sheet, that means that I brought the final volume back up to 100% (because water evaporates off while batching). This is the same as …
  • I would agree with @crisbaysauli that staying in the industry and gaining experience (even if you are are QC chemist) is certainly worthwhile. The degree will be of equal if not more importance though. Experience as a QC chemist will give you an und…
  • @Kirk Thank you for pointing out what it is called! I feel like I had known that at one point and then forgot... I have tried with two different emulsifiers, Glyceryl Stearate and Avalure Flex-6. Both of them soaped. I actually thought it was the e…
  • OK, I really had to think on this one, but after some brainstorming I believe Lecithin is both endogenous to human skin and an emulsifier. What do you guys think?
  • @chemicalmatt thanks for the fun fact on the "PEG-40 Hydrogenated Castor Oil!"
  • According to the PCPC Aminobutyric Acid (gaba) is readily available and is considered a skin conditioning agent. Not only that, there is reliable literature on pubmed indicating that it may be effective. Goes without saying, but I would suggest not …
    in GABA Comment by gfeldman March 2016
  • I could give it a try. I can imagine how the stearyl alcohol's presence would inhibit a crystallization matrix. Thanks for the suggestion @Bobzchemist!
  • Does he not need some kind of oil in silicone surfactant to keep them together? I do not know of a good one off the top of my head, but I believe that would be what is required here. You guys have any suggestions?
  • Agreed @chemist77, that is a great description @t4m456. Thank you for sharing.
  • @nitana Unless you have high shear capabilities, I would suggest using a coated form of Zinc Oxide. It can then be dispersed in either your oil or water phase dependent on the coat (typically oil phase).
    in Zinc oxide Comment by gfeldman June 2015
  • (sorry, used slang, by newbies I mean those who are not terribly familiar with chemistry)
  • @pushent I would be glad to give you a quick lesson in cosmetic chemistry for the price of lunch ;) I live in Indianapolis, Indiana so it should be pretty convenient for you too! Also, on the side of my day job, I teach introductory college chemistr…
  • @mikebavington Hi Mike, First of all, thank you for the kind suggestion to @vnatale87. I think it is good advice on how to start out. I am trying to follow that advice as well, but I am encountering some difficulties. In particular I am trying to…
  • @perspicacious I believe @bobzchemist was referring to the testing of cosmetics and not the individual RAW materials used in cosmetics. Cosmetics, in the US at least, are not tested on non-humans for skin or eye irritation.
  • @David I would suggest selecting the continuous phase as the phase that the active is soluble in. @Bobzchemist I do believe that the phase the active is added to could make a difference, I am still uncertain about delivery, but for efficacy... R…
  • @ David If you are concerned about topical delivery, have you considered looking into penetration enhancers? Common penetration enhancers are propylene glycol and ethanol, but there is a wide variety of molecules that use various functions to help…
  • @David Thank you! I agree. Although, I believe that the phrase "Not tested on animals" should not be allowed as it is in fact scientifically incorrect. For giggles, to correctly state it; "Not tested on non-consenting animals" o…
  • @Belassi My brother was trying to talk me into producing something like this (a lotion, to be produced and sold in Colorado) and I told him it wasn't possible (for me) because it would be considered an OTC.. was I wrong??
  • @markbroussard Interesting article, thank you for sharing.
  • @laskedbetter Good old common definition versus biological definition. I like your explanation quite a bit though. Your explanation points at another topic that disturbs me quite a bit, "organic" products. By scientific definition if som…
  • @Belassi An animal is a multicellular, eukaryotic organism of the kingdom Animalia or Metazoa. Humans belong to the kingdom Animalia. How are humans not animals?
  • @ledude thank you for sharing your experience with the cellulosic thickeners. I use cellulose based thickeners as secondary thickeners on occasion and I have been exploring the idea of using them as a primary thicker as well. Many of my formulatio…
  • @pma thank you for bringing up this question. I was just wondering the same thing. @Perry & @milliachemist have either of you found a benefit in using diglycerin (DG) over glycerin? Because it is a less common item, I'm certain that diglycerin …
  • @milliachemist I would love to increase the amount of polymer, but that will increase my initial thickness which is not something that I would desire. What other alternatives would you suggest? @Jeannie Thank you for the suggestion. That is roughly…
  • I would highly recommend reading the "INCI Nomenclature Conventions" as a new cosmetic chemist (in particular Alkoxylated Materials). I found it very useful myself. It will give you a greater understanding of what you are actually looking …
    in PEG Comment by gfeldman May 2014
  • Yes. Polyquaternium 37 is also a polymer. I don't know what was going through my head when I mentioned that one.. the prefix "poly" kind of gives it away! Ignoring that embarrassing mistake, I am still curious about alternative methods to…
  • Thank you for the suggestion! To be honest though, its not a problem in my formulas :) I love silicones. My colleague on the other hand works with Silicone free formulas. I am also concerned about the source of the whitening. Do you know what causes…
  • No. I am absolutely not committed to Polysorbate-20. I also happen to have Pemulen TR-2 on hand. I tried a couple of batches today with it and didn't have much luck. Not because of the Pemulen, I just think that my formulas were not up to par. I'm t…
  • I am aware of the HLB system and I understand the calculations. Familiar might be an over exaggeration. Polysorbate-20 is high HLB (16.7). So I would need a low HLB emulsifier to pair with it (also one that is liquid at RT). Do you have any suggesti…
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