Bill_Toge
Forum Replies Created
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@ngarayeva001 by that logic, nobody should ever drive a motor vehicle or cross the road, because there is a possibility they’ll be involved in a road traffic accident
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overhead stirrers are no good for lotions, they don’t generate enough shearcan you adjust the speed on the stick blender you have?if not, get a variable-speed stick blender and run it a speed that will circulate the batch effectively, and is slow enough not to introduce an excessive amount of air into it
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you can solubilise, i.e. dissolve it in propylene glycol, but that will have no effect on its (lack of) oxidative stability
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it doesn’t matter whether you call it a liquid wax or an oil - they are chemically compatible, so they should mix together
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if you want to do it by the book, you’d have to list each component in the milk on the label, converting the nomenclature to INCI names where needed - same as any other raw material comprised of a mixture
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further to @EVchem ‘s point, although SCCS opinions are hefty documents these days, they do have neat, concise summaries at the end that tell you what you need to know
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+1 for limonene
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my suspicion is that one or both of these oils is not what it claims to be - both oils should mix together and form a uniform stable mixture without any need for a third substance
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there are a number of UK companies which sell new and used process plant/factory equipment, e.g.:
https://www.centriplant.co.uk/
as an aside, Greaves make good-quality shear mixers, as do Rigal Bennett - they have the advantage of being significantly cheaper than Silverson
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@Sibech 1,2-glycols are microbistatic (or at high enough concentrations, microbicidal) due to their chemistry, and the effect increases with carbon chain length - this is why they have a preservative effect, nothing to do with water activity
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and in Europe it’s been banned from cosmetics since 2001, which means its usage has been restricted to medicines, which are subject to much more rigorous safety testing
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as a rule I’ve always started at 1.0% regardless of pH, and have only had it underperform twice (out of 5-6 dozen products)@Sibech you’d need to increase the glycerine to 40% w/w or more for it to have a significant impact on water activity
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the notion that the nature of an emulsion is determined by the percentage of water (weight, volume or molar percent?) is a surprisingly long-lived urban myth that flies in the face of actual evidence, and the laws of thermodynamics, and is cited as fact without anyone actually thinking about how or why it works
a few months ago I made a thread debunking it in detail
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skin lightening creams with illegal ingredients are the most common reason for cosmetics to appear on RAPEX reports - and Trading Standards have been known to bring the hammer down on repeat offendersanother frequent cause for prosecution is imported ‘henna’ with synthetic dyes which have been banned in Europe for 20+ years, and/or non-permitted forms of peroxide (most commonly barium peroxide)also: full credit to the Guardian for sticking to the facts and not turning that article into an excercise in political hand-wringing
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here’s your answer:“The system then uses high concentrations of cystine, a major component
of human hair. This is incorporated as Croda’s ingredient Crodasone Cystine (INCI: Cystine Bis-PG- Propyl Silanetriol (and) Water (aqua)),
a copolymer of amino acids and silanol. Under heat, the silanol
cross-links with the hair fiber to provide a protective shield on the
surface of the hair, while the amino acids enhance the longevity of the
treatment by aiding in the restructuring of the disulfide bonds. The
result is sleeker, smoother hair that requires less time and effort to
dry and style.” -
try hydroxystearic acid, or hydrogenated castor oil
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try salicylic acid
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there are plenty of oil-soluble resins, but they’re not suitable for styling because they won’t wash out (or will only do so with great difficulty)
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They do not recognize the fact that it is often dose-dependent.because that requires the use of basic mathematics, which in the anglosphere is either viewed as a terrifying black art bordering on witchcraft, or as literal-minded donkey-work that the truly intellectual shouldn’t have to lumber themselves with
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what’s the setting temperature of the product, and what temperature are you filling it at?
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you’d need to hire a consultant for that kind of work, someone who can learn your processes and materials, and be able to suggest workable alternatives; and a decent consultant will charge a lot for this kind of service
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as it happens, products of this type based on cationics do exist, but they’re rarequite a few years ago there was an antibacterial handwash based on cationics and sold under the Dettol brand; my task was to try and create a functionally equivalent product while not infringing their patents, which proved difficult(it was also sold as a human-use biocide rather than a cosmetic, but that’s a whole different story)
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try Lathanol LAL from Stepan (sodium lauryl sulphoacetate)
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then you’ll end up with a different product
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for removing dark spots, you need an ingredient which inhibits melanin synthesis - nicotinamide, retinol, arbutin and vitamin C are the most commonly used ones@em88 is Plastic Surgery a brand of time machine?