Bill_Toge
Forum Replies Created
-
it depends how much you trust the person/company you’re buying it from
ideally, they should have done it themselves before offering it for sale
-
in this industry, homogeniser = high-speed rotor/stator mixer
also, if you put anything a slurry it shouldn’t hydrate at all; the idea of a slurry is that you add it to water, so that the slurried substance disperses slowly, allowing it to hydrate uniformly, and (hopefully) without lumps
-
@sjinesh the phenomenon you’re describing is phase separation - Ostwald ripening is something else entirely (dispersed phase becoming physically detached from the emulsion interface, which is extremely unlikely to happen in a system like this)
-
that’s very surprising!
we (and every other UK manufacturer I know of) take the results on raw material suppliers’ CoAs as read, and ISO 22716 auditors have never had a problem with that
apart from basic checks for colour, odour and appearance, the only tests we carry out on raw materials are on water (produced in-house, and the most sensitive raw material we use), SLES (for pH, to check it’s the right blend) and dyestuffs for hair colours (to check they’re the right colour when dyed out)
personally, I’d dispute that conclusion
-
in my experience, ingredient lists on styling products are notorious for being incomplete, or just plain wrong - personally, I’d take that list with a very big pinch of salt
-
@marek.barnas 1,2-diols (of which propylene and butylene glycol are examples) have antimicrobial effects; the activity increases as the chain length increases
unfortunately, as the chain length increases, solubility decreases and the taste becomes much more unpleasant
they can act as solubilisers as well - the effects are not mutually exclusive
-
the easiest way to do that is to add a high HLB and a low HLB surfactant (e.g. PEG-40 hydrogenated castor oil and glyceryl stearate) to an anhydrous formula, so it has some means by which it can mix with water; it’ll be water-resistant, but will wash out with shampoo much more easily
-
has that been stored in a humid atmosphere?
when we get samples of this and other oxidative dye precursors, the supplier typically puts a packet of silica gel in the container; in general, these substances keep well, provided the containers are sealed tight, kept cool and exposed to as little air or moisture as possible
-
what benefit would water-based products have over your current ones?
I ask as water-based products are an order of magnitude more complex than anhydrous ones, and most styling resins (which you would need to create a high-performance product) are not generally available to home crafters
-
the main ones apart from sodium benzoate are sodium methyl paraben, and propylene / butylene glycol
bronopol used to be used a lot, but not so much these days as it causes the product to go yellow over time
-
this article discusses special effect pigments in detail; duochromes are on the second to last page (“effect pigments based on silica flakes”)
-
@marek.barnas it is true; sodium benzoate is completely ineffective above pH 5
-
the fragrance house will also have to declare any hazardous components on the MSDS (many of which are not required on the label), but only they and the manufacturer will be party to that
-
for my two penn’orth, I might add that in Europe, soap formation with sodium and potassium salts is exempt from REACh regulations - i.e. it is not ‘officially’ classified as a chemical reaction, and manufacturers don’t have to register their product with European Chemicals Agency if they make more than one ton per year
however, this exemption does not cover TEA soaps; this is the main reason why many branders in Europe have moved away from them in recent times, and a likely reason for apparent discrepancies between European and US formulas for the same product
-
it’ll disperse just as well if you use a low HLB surfactant
-
if you want to solubilise a fragrance into oil, you need to use a low-HLB surfactant (e.g. oleth-3); polysorbates will not do the job effectively
-
it’s a polysiloxane, i.e. it has a fundamental structure comprising multiple Si-O bonds
the carbon equivalent would be a polyacetal, but due to the difference in chemistry between carbon and silicon it would be difficult, if not impossible, to synthesise such a compound and have it remain stable; silicon readily catenates (forms chains) with oxygen, while carbon does not
-
2. not necessarily - if there’s not enough water in the formula to sustain microbial growth, the product can easily pass a challenge test without an active preservative (at my last place, this was our preferred method for preserving toothpastes)
personally I’d describe that as “self-preserving” rather than “preservative free”, as it’s less ambiguous and less open to legal challenges
3. that depends on your target market, and their attitude towards parabens - there is nothing intrinsically wrong with them, and plenty of evidence to show that they’re safe in finished products, they’ve just been maligned due to bad/misunderstood science
plenty of major branders on this side of the Atlantic still use them, and it doesn’t harm their sales or their reputation
-
the aeration depends on the level of polymer used - when neutralised and back acid thickened, both polymers I mentioned are effective suspension agents at very low levels
-
you need to include a surfactant-tolerant polymer to suspend particles in a product like this - in my experience, Carbopol Aqua SF-2 and Aculyn Excel do the job very well
-
CMC is anionic, it won’t stay stable in the presence of cationic guar gum
-
in my experience, safety assessors/toxicologists always cite the CIR and SCCS as primary sources for their safety data - not one of them cites the EWG
to my mind, that really says it all
-
I both love and hate HC Blue No 15 (Jarocol Blue 15 / Arianor Jade Blue)
I love it because it creates a striking and quite beautiful colour not achievable with most other safe / legal / effective / widely available blue dyes
I hate it because it stains everything it touches with a vengeance, and it’s particularly difficult to shift
-
@MarkBroussard what kind of percentage would typically be used for this purpose?
-
it’s mostly oxygen from the air; if a solution containing a reducing agent is exposed to the air, it will draw the oxygen from the air, and if the solution has a low viscosity, any oxygen introduced into the product will rapidly diffuse through it
perm lotions are a good example of this; the thioglycolic acid in the perm will readily pull the oxygen from the air, creating a pressure differential between the inside and the outside of the container, and if the head space is relatively large (e.g. if the container is partially filled) this causes the sides of the container to warp
permanent dyes, which are usually high viscosity and non-Newtonian liquids, are also a good example, as oxidation in this case causes visible discoloration of the product; because the product is non-fluid, the rate of oxygen diffusion through the product is very slow/zero, and oxidation only occurs near any surfaces exposed to air