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Where can I find my previous posts and conversations?

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Thanks for the recommendations. I’ll start with contacting a couple of suppliers and take it from there 

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@Gordof Thanks for that.
I’ve come across those on Prospector too. They’re all foundation creams (makeup) containing pigments and the product is in paste form (hot fill) not a cream. I may have to substitute those powders with some kind of starch and keep the consistency pumpable. I’ll do a couple of trials to see how it goes…
What silica powder or Starch would you recommend?
Cheers

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Pharma said:

Gordof said:

…
For a visual effects, I don’t have an idea for that right away.

Wouldn’t that be those ingredients having a ‘soft focus’ or ‘matte’ effect? Certain silicones and modified starches and the like would, again, fit that bill.

Thanks for the comment. What modified starch grade would you recommend?
Cheers

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Gordof said:

do you mean powdery Visual or the sensory of the product? 

you can get sensory a powdery finish if you add silica powders or Starches.  there are a lot of types modified and un-modified depending on the formulation type and effect you want to get.  you can although get this sensory effect with the right emollients. For example, Caprylyl Caprylate/Caprate (Cetiol RLF) will give a very powdery after feel in the right amount is added to the formulation. Some silicon oils will give the same or even better effect. 

For a visual effects, I don’t have an idea for that right away.

Thanks for the comment. I mean both visual and sensory. A product that pumps like a cream for ease of use then physically turns to powder upon rubbing on the skin. Not even sure if such thing is possible but would be great to avoid the mess that powders make…
The opposite concept is possible using silica dimethyl silylate for a powder to cream application.
The product should be occlusive and highly emollient hence I did not consider silica powders or Starches as they absorb oil and can leave a chalky dry after feel. Did you have a special silica powder or Starch grade in mind without chalky residue? 
Thanks

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Hi @Squinny, 
Thanks for the reply. I agree, NDA & TRULUX offer good customer service. Will probably have to contact them instead.

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@Juggsy @Squinny lots of good supplier info here, thanks for sharing. I am based in Australia also. Any idea how to get in touch with Escentials of Australia? I need some technical support but can’t get a hold of them via email nor phone… 

I must agree Trulux is super expensive but I still use them sometimes since they state the trade names. This however is changing as they grow, seems they started to use INCIs more and list 5-10 suppliers/trade names for each INCI. New shipping cost is also getting in the way.

AI was good, shame they’re no more. NDA is ok but very annoying they don’t disclose trade names!

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Storm said:

Perry said:

Honestly, we never did find what caused the problem. As I recall, it was one production batch and it didn’t happen again.

It’s likely that there is some kind of oxidation reaction happening. So adding an antioxidant or EDTA may help stop the problem.

Thanks Perry, There’s no oil or fragrance in the formula do you think oxidation is still a concern? As for chelating agents I always consider adding them in foaming products, would you add them in serums as well?

Also, how long after manufacture did you notice viscosity drop?

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Microformulation said:

We had a similar issue years ago with a Natrosol product. We did a lab mock-up and it was the HEC. They took it back as a return no questions asked, provided a different batch and it never repeated.

Interesting! thanks for sharing Microformulation. How long after manufacture did you notice viscosity drop?

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Perry said:

Honestly, we never did find what caused the problem. As I recall, it was one production batch and it didn’t happen again.

It’s likely that there is some kind of oxidation reaction happening. So adding an antioxidant or EDTA may help stop the problem.

Thanks Perry, There’s no oil or fragrance in the formula do you think oxidation is still a concern? As for chelating agents I always consider adding them in foaming products, would you add them in serums as well?

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Perry said:

I recall that happening to a formula I worked on. It too was a serum thickened with hydroxyethylcellulose. I believe it was a microbial contamination issue.

Thanks for the comment Perry, stability microbial test results are clean so I doubt contamination is the issue here. The preservative used in the formula releases gluconic acid over
time, could this breakdown the polymeric network from your experience?

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Anyone?

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chemist1 said:

Pureact WS Conc-Sodium Methyl Cocoyl Taurate would be a perfect surfactant for this type of application. 

Thanks for the suggestion Chemist1. I’ll give it a try.
I’m wondering at pH=4.5 do I need to include an amphoteric? Chemically speaking it will turn to a cationic at that pH right? Wondering if that will be incompatible with the rest of ingredients!

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Agate said:

Can’t answer all the questions, but from my experience I haven’t noticed a difference between Coco Glucoside and Caprylyl/Capryl Glucoside in mildness or foam. The main difference that I’ve seen is that Coco Glucoside is cheaper but Capryl/Caprylyl Glucoside works better as a solubilizer.

Thanks Agate for the comment. How does Decyl Glucoside compare with the other two?

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MelindaNicole said:

What about Sodium C14-16 Olefin Sulfonate and cocoamidopropyl betaine? Here is a neat chart of sulfate free surfactants with details, off of Making Skincare https://makingskincare.com/sulfate-free-surfactants/

What a useful chart, thanks for sharing Melinda.
I don’t have access to small quantities of Sodium C14-16 Olefin Sulfonate but form the chart Pureact LSR (Sodium Lauroyl Sarcosinate) seems to be another option.
Not sure if Sodium Lauroyl Sarcosinate can be used as primary surfactant though? have you worked with this one before?

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I’ve accidentally posted this under general category and had to repost under formulating as I can’t move this one!

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Thanks for that

????