[David]

[David]

I have experience in formulating permanent hair dyes and I have formulated some 5 min colors in the past. Nothing really secret about them just a bit differently formulated. There is a very large difference between 1 and 5 minutes though and if there is a “secret” it is probably forbidden in EU/US

[David]

I read the article and I find it very interesting that in contrary to common belief, the skin actually naturally contains 2-4% n-alkanes. However, the authors also admit the n-alkanes could origin from somewhere else, .i.e. cosmetics,  (although very unlikely). Someone else has more info?

[David]

Theoretically it is an interesting concept trying to mimic the skins lipid ratios by using cosmetic ingredients, but I doubt it has any real benefits regarding moisturizatation etc. However, intuitively I would approach it in the same way you mentioned - by first have a look at animal fats (like lanolin), then modify the lipid profile.

[David]

My dictionary of Chemistry states that also carbon black is an emulsifier.(or actually emulsifying agent, not to be confused with a machine producing an emulsion)

[David]

What exactly do you mean with review? Check stability / quality / price / safety ? 

[David]

I was wondering if there is a strict definition of what an emulsifier is, are all molecules with hydrophobic/hydrophilic groups emulsifiers? And with nasrins definition “every material which helps in the stability of an emulsion is emulsifier”  - also carbomer would be an emulsifier…

[David]

Go for 

• Méthodes de synthèse & analytique

You will then encounter for ex. GC-MS which is frequently used to identify / quantify perfume composition

[David]

Not really. You could test it @50C and do freeze/ thaw cycles. Most unstable formulations separate in a couple of days, but it is no guarantee.. .What I do if I have time limitation is to use my chemistry knowledge + my experience to do a qualified guess and then discuss it with the customer. Usually the customer prefers to wait instead of taking that risk.

[David]

I would start easier: 

aqua(water), stearic acid, glycerin, triethanolamine, and preservative.

These few ingredients will, if you find the right %, make a nice cream already.

From there yo can tweak it with perfumes, oils, extracts or whatever you like.

[David]

Perry, that is exactly why it is confusing - you have the same word for two different things.

[David]

Mark, you are correct. GMO is a clearly defined scientific term and differs from hybridization.

(hybridization is a modification of genes but not GMO according to the definition…)

[David]

I think the term GMO is unfortunate and confusing, for example WIKI states: “In Europe genetic modification is synonymous with genetic engineering while within the United States of America it can also refer to conventional breeding methods” 

It should be defined precisely which modification technique is used before discussing whether it is safe or not. I mean, isn’t every newborn baby a genetic modification of his/her parents DNA?

[David]

TEA won’t harm your skin, probably not even trace amounts of nitrosamines, however it is risky and above 50ppb is forbidden in Europe. So my advice is - avoid TEA if possible. It is true that you need DEA to form nitrosamines but TEA always comes with trace amounts of DEA (no matter how pure).

[David]

..and remember not everybody is from the US here… besides good science should be clear and logic, not full of fuzziness that can be misinterpreted.

[David]

Here are some facts regarding pH of animals.

https://www.jstage.jst.go.jp/article/jjvc2001/24/1/24_1_9/_pdf

[David]

Good detective work, definitely looks like PEG-8 dimethicone is in there.

[David]

@Bob, how can the supplier get away with it? Is it legal to photoshop pictures? 

[David]

Hi Kerem,

I have developed some of these products in the past.

Similar to the benchmark VEET.

http://www.veet.co.uk/products/creams/sprays/veet-spray-on-hair-removal-cream-normal/

You can drop me an Email. (I am based in Europe)

[David]

First question here: is the benchmark experience the same? Since the INCI are from the benchmark… 

[David]

I would take out the CTAC, set the Germall at the right level (0.5%), lower the extract to 0.1%.

If that doesn’t work  - exclude the fragrance. Carbopol is effective - if you like to stabilize airbubbles!