[LuisJavier]

phenylethyl alcohol is such an interesting preservative/aroma material to me. How does it differ from phenoxyethanol in terms of antibiotic protection? 

[LuisJavier]

Sounds very dangerous Belassi

[LuisJavier]

Is it not worrying that a class 1 carcinogen (acetaldehyde) be present in blood?

[LuisJavier]

Yes, I imagine some of the benzyl benzoate would be fully combusted if it gets sucked into the wick and then the flame, but some of the benzyl benzoate would just evaporate from the melt pool due to the heat of the flame. IFRA standards really do not make much sense to me. Benzyl benzoate is just one example where this would apply. 

[LuisJavier]

Are the streaks a combination of the leucidal and pathogens?

[LuisJavier]

Am I correct in thinking that for this application, peg-60 hydrogenated castor oil could be an even more effective solubiliser than peg-40 hydrogenated castor oil? There is also peg-60 castor oil (non-hydrogenated version) and I wonder if it’ll be more effective than the hydrogenated version.

[LuisJavier]

I’ve done some reading on it but not enough for em to remember; it was quite a long time ago. If ethanol does penetrate into at least the upper layer of skin, I wonder what happens to it. Surely it still gets metabolised, no?

[LuisJavier]

Could you recommend me an anti-foaming agent? Since my perfume would be sprayable, would foam still be problem?

[LuisJavier]

I am currently using DPG at about 5% of the formula and I’m wondering whether to use a bit more or whether to swap it out for hexanediol. I recall reading that DPG is very useful as opposed to MPG in perfumery due to former’s low hygroscopic nature. Thank you for your advice on using sodium salts of parabens - that does sound like a good idea. I am currently using 15% Tween 80 but I will see about decreasing this or switching it out at least partially for peg 40 hydrogenated castor oil. I can try and eventually get my hands on the polysugamulse; it seems to be a bit difficult since a lot of companies don’t seem to like delivering to a residential address.

[LuisJavier]

Thank you. Do you personally avoid aluminium/alum? I find ammonium alum to be the longest-lasting deodoriser for me. I recall reading that aluminium sulphate is more of an antiperspirant, which is strange, because ammonium alum contains a sulphate too. I do find that I still do sweat with ammonium alum so I guess it does not become absorbed as much as a standard antiperspirant does. Do you know of any long-term studies being done on alum/inium that may result in us knowing whether they are definitively a risk factor for Alzheimer’s disease? Also, just to satisfy my passion for chemistry knowledge, why does a halfway covalent molecule such as aluminium chloride result in more absorption than a truly dissociated aluminium molecule?

[LuisJavier]

Wouldn’t the oily phase be the tween 80? Lol I might just be totally confused

[LuisJavier]

Won’t parabens simply migrate to the oily phase of the solubilised solution, especially without any stabilisers such as cetyl alcohol to hold them in place (if they even do that)?

[LuisJavier]

I’ve been really struggling trying to obtain a sample of hexanediol up to now.

[LuisJavier]

Gunther said:

Poly Suga Mulse D9 beats PEG-40 hydrogenated castor oil, and the latter beats Polysorbates.
DPG can help and it doesn’t foam as the previously mentioned ones do.

At the end you’ll need to conduct tests with the specific fragance used.
There’s a huge variation in fragance polarity.

Does Hexanediol acts as a much more powerful solvent than dpg, or is the difference not too great?

[LuisJavier]

That sounds terrible

[LuisJavier]

All of the above is really making me desire to skip the peg-100 stearate and replace it with sodium stearoyl glutamate.

[LuisJavier]

Hahaha I can imagine your disappointment. However, the Montanov series seem quite different in that I haven’t seen any of them contain polyglyceryl-2 dipolyhydroxystearate or glycerin. I was planning on simply combining decyl/lauryl glucoside with glyceryl stearate.

[LuisJavier]

Haha, well I didn’t expect for it to be a terrible idea, but I can believe you. Montanov 58 MB seemed non-comedogenic though, though it contains cetearyl glucoside instead. Maybe decyl glucoside is less comedogenic than the other ones I listed above?

[LuisJavier]

It seems that lotioncrafter maintains that even sodium benzoate is inactivated by non ionic surfactants. https://lotioncrafter.com/products/sodium-benzoate

[LuisJavier]

Very good tip. May look into paying a company for this service.

[LuisJavier]

Would sodium benzoate at 0.4% in a face cream cause significant viscosity loss if using Ultrez 30 at 0.4%?

[LuisJavier]

Update: 9% HP solution was very effective at removing stains from the porous material between the bathroom tiles but almost totally ineffective at removing any stains from the rubber sealant lining the bathtub. Instead of making performic acid, I think I may just remove the rubber sealant and apply a new sealant over the area. This conversation has somehow turned about household cleaning haha. Back to cosmetic metalware, I’ve run out of rubbing alcohol so I’ll see how 9% HP works for now. Let’s see if it’s also able to remove scent that just seems to stick my stainless steel pitchers.    

[LuisJavier]

EVchem said:

@LuisJavier I’d rather take dioxane than benzene any day of the week.

As far as I know dioxane is considered possibly carcinogenic, and definitely bad for the environment. There are suggested limits for exposure

Benzene is a confirmed carcinogen, and associated with a host of other conditions. There is  no safe concentration.

Very interesting! I read somewhere that a lot of the negative health effects seen among the children born to the Vietnamese who were exposed to agent orange was due to the dioxane impurity in the process of making the agent orange (the producers weren’t too concerned in purity).

[LuisJavier]

Isn’t sodium benzoate strong on mould?

[LuisJavier]

For me, in this case, a most powerful solubiliser would be one I need to use the least of in a water-perfume. I am not planning on using vegetable oils but fragrance materials instead. I would be using materials like vanillin, ethyl vanillin, propenyl guaethol, methyl dihydrojasmonate, coumarin, guaiacol to build a 7-10% fragrance oil-in-water perfume. I was planning on using solvents like hexanediol to lower the amount of solubiliser needed. I am not at all bothered by having the final result be a milky, cloudy solution, but I do not want to be using around 25% polysorbate 20 just to achieve a stable emulsion. I also want the final solution to be sprayable.