Doreen
Forum Replies Created
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You’re welcome!
Yes, I added the link for the US (Making Skincare site shows two links, for UK and US).
Good luck!
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You could use it as anti-oxidant at 0.2% combined with tocopherol(s), or used in higher concentrations as skin active (± 2-5%).
You can dissolve it in the oil phase, it’s stable up to 113°C. -
The small attachment (which is actually meant for stick blending baby food in small jars) is very handy.
(Link comes from Making Skincare site)
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It does indeed sound like someting acidic has reacted with the baking soda. What are the other ingredients in the deodorant?
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@ngarayeva001
There is nothing wrong with the slides from Lotioncrafter I think, it’s that some people believe that only Preservative Challenge Tests are useful.
A slide or plate test of course only tells you that there is contamination by bacteria, yeast or fungi, it doesn’t tell you the species. Sometimes it’s obvious, but many times it isn’t. (To me at least, as I’m not a microbiologist.) So you won’t know if the microbe growing on the plate is a pathogen or not.I understand the people who believe that, but personally I still find the plates useful. If there is no contamination it assures me that the batch is ok, if there is, I just throw it away. You only need a bit of patience to wait before you can use that what you have just made.
I don’t know about the slides, but the plates get contaminated very quickly, which has been a reason that a type of plate we used at work to test surfaces was ‘double sterilized’. This meant that not only the plates are sterilized, but also the primary packaging material around it. It was more expensive, but finally we had no more contamination of the unused plates (also no more condensated water in it). Before that we were in doubt if the contamination came from anything else than the subject we had tested.
@MarkBroussard
I agree with you that contamination rarely comes from particles in the air and that you want to test real life situations.
The point I tried to make was, that if you would test your concoction in a ‘dirty’ environment, you might not know if the contamination came from the environment or from your product.
But you’re right, no matter the source, any contamination would point out that the way the product is preserved isn’t adequate or else the microbes would have been eradicated by it. Thanks for reminding me of that. -
@MarkBroussard
Point with the plates/strip tests is that as a homecrafter you can’t do these in a cleanroom under the right circumstances, so you’ll never know 100% sure, the contamination might also have come from the air.
I can get the plates extremely cheap and it’s nice as extra test, but the best way of course is to let these tests be done by a lab, where everything is completely in order cGMP-wise. -
MarkBroussard said:If you don’t do either a microbial plate test, strip test or Preservative Challenge Test, you have absolutely no idea whether or not your preservation approach is working or not. While the growth of mold may be obvious to the eye, other forms of microbial contamination are not at all obvious to the eye or smell.
Even if you are a homecrafter, you should at least run strip tests on your batches to see if you have any contamination. They are readily available from a couple of the homecrafter ingredient sites.
Absolutely true. I can get those from work, so it’s easy for me (the plates expire fast, so this is better (and cheaper) than ordering abroad).
I also want to have challenge tests done in the future, with several preservative blends. -
What is the pH?
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MarkBroussard said:Again, proper preservation is not simply a matter of adding one ingredient to a product.
Totally agreed.
@ngarayeva001
We as homecrafters usually have to rely on ‘stronger/sturdy’ preservatives like Germaben II, (Liquid) Germall Plus etc because we usually don’t do tests. And especially when stuff like clay is included. Plus we can never achieve the same level like the industry cGMP-wise (air treatment etc).
And even blends like Germaben can lose its ‘strength’. Especially the parabens in it are said to interact with several substances.
For as far as I know (Liquid) Germall Plus has the least interactions and is very versatile, maybe that’s why Susan from Swift uses it most of the time.
(Edit: I also use the hurdle approach when using Germaben and Germall btw)But not all people here asking (preservative) questions are homecrafters.
Euxyl PE9010 indeed is broad spectrum, it can be sufficient for molds also, as Mark explains. It totally depends on your exact formula if it is the right choice in a certain %. Only by doing microbial tests like challenge testing one can be sure. Any change to a formula, even minute ones, would justify retesting.
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@ngarayeva001
I didn’t have issues with PCA and Zen? -
Dr Catherine Pratt said:Yes I am sure there are many ways to store glass beakers etc. I worked in a lab once and we were using GCMS at very small levels (ng & pg). So after the alcohol we put Aluminium foil over the top and then stored them. Even then the blanks still had contamination in them.Has anyone else had to do this, or maybe there are different ways to store glass now?
After glassware was thoroughly cleaned we had to rinse it with purified water and let it dry in a drying chamber. Afterwards cover it in plastic, date written on it. After a month, used or not, same procedure again.
Before use sanitizing with IPA 70%.This was procedure for glassware used for non sterile preparations (like ad hoc dermatics) in a GMP certified hospital pharmacy where I worked.
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:joy: :joy:
@Biochemist
Belassi is back!
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Dr Catherine Pratt said:You can re-use glass pipettes but you must steep them in hot soapy water, then ethanol to sterilize.
Ethanol doesn’t sterilize.
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@ngarayeva001
And of course parabens are in bold an extra big letters! :joy: -
@ngarayeva001
I also use sunscreen in winter here in the north, even on cloudy days as UV-A penetrates clouds (and glass). I get extra vitamin D from supplements.
You will also recognize the problem to find the right foundation in the lightest of colours, I bet? And coming home after buying the lightest of lightests finding out it is still too dark!I think it’s crazy that only the pale skin colour we have by nature seems suddenly the norm for every woman. Have you seen Asian ads? All the women have a pale skin. And many African women with straight hair (and pale skin). It’s one thing if you just happen to like it. It’s very sad if one feels the need because the media tells you your native skin/hair is less beautiful/desirable.
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You can buy plastic disposable pipettes on AliExpress very cheap.
I agree with Sibech, never re-use them. Unless you have an autoclave, you can’t sterilize anything at home. it’s best indeed not to pour a liquid back into a container (also regarding cross contamination with other substances). -
It’s sad. A lot of us tried to sunbathe as much as possible to get that beautiful bronzed/brown skin teinte (I didn’t because of my sun allergy). I nearly felt inferior because of my delicate porcelain skin.
The only advantage that sun allergy may have brought me is that at age 41 I still haven’t got a single wrinkle. That and not smoking perhaps?But I still don’t get why Asian and African-American people would like to bleach their skin. Be proud! You’re beautiful!
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Dr Catherine Pratt said:Yes honey dissolves in water and if your lucky you may end up making mead! but it also becomes food for yeasts and microbes. Honey on its own is full of phenolics etc which I believe keep it preserved in its natural state.Maybe add the raw honey at the end of the formulation when the last phase has cooled to the same as the honey temp. Then mix is through?
Agreed. Only if it’s used pure at 100% (and untreated). Once dilluted it’s a source of contamination.
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So now polyols are targeted as well? Pffff… unbelievable.
Oh of course! Because they’re used in anti-freeze!!! How can we put that on our skins!!!! :#
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Ok, thanks guys, didn’t know that! :+1:
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W/O usually feels greasier.
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@ngarayeva001
NaOH is considered ‘natural’? -
@Chemist77
:joy: :joy:
Same to you! Have a fabulous 2019 everyone! -
N.B. I use these ingredients in an AT/deo cream for the armpits only.
I don’t see the use for or value of deodorants for ‘private parts’, like this Lume product advertises. Deodorizing odours from blood, urine or semen? These people need a shower, not a deodorant!