fareloz
Forum Replies Created
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It depends. Usually yes, you want correct pH before adding the ingredient, because some ingredients might be sensitive (for example Sodium Ascorbyl Phosphate). But some (Niacinamide) are that sensitive to pH, so it can be adjusted later.
I don’t know about Alpha Arbutin, but it is better to be safe - measure and adjust the pH before and after addition (because the ingredient itself can change it)
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If you need a formulation service you can get it in another topic here: https://chemistscorner.com/cosmeticsciencetalk/discussion/formulation-services-needed-get-help-here/
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Allantoin solubility is 0.5% top. You have 40% water, so 0.2% is top.
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We need to know the testing procedure and efficacy criteria to answer the question
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If you need a formulation service - go here: https://chemistscorner.com/cosmeticsciencetalk/discussion/formulation-services-needed-get-help-here/
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Yes, shea butter is known to be notorious for getting grainy:
https://www.reddit.com/r/DIYBeauty/comments/1cid9na/i_think_my_homemade_beard_wax_is_suffering_from/https://www.reddit.com/r/DIYBeauty/comments/ex7ziz/grainy_shea_butter/
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Niacinamide is water soluble. It won’t dissolve in oils.
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Ascorbic acid will dissolve in water that your skin has.
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HEC is mostly used in personal lubes because it has very slippery feel. Not sure you want it in a face cream. I would suggest switching to Xanthan Gum Soft or even better some synthetic polymer like Sepimax Zen or Aristoflex.
But if we look even deeper to the original intention. You want to make your face cream creamier. Usually we use oil thickeners for this. Cetyl Alcohol is the one who gives this creaminess feel without making the cream heavy,
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Hey! I know you from reddit DIYBeauty sub. Remember their rules? No DIY sunscreen? That’s because you will never be able to make sunscreen at home.
Sunscreen works by creating an even layer on your skin. It is not about the filters, solubilizers or high content of the filters, it is about even distribution of nano particles. Some filters are in nano form and not really solubilized, but distributed/dispersed so well and even that you think they are dissolved. For this you need really high end equipment and knowledge.
So drop this idea and buy one.
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You will never be able to make sunscreen at home.
Sunscreen works by creating an even layer on your skin. It is not about the amount of oxides, it is about even distribution of nano particles. For this you need really high end equipment and knowledge. Even if you smear pure zinc oxide on your skin it will give you spf 5 top.
So drop this idea and buy one.
More detailed explanation: https://www.youtube.com/watch?v=wCPp8EJSG-Y
Also, mineral sunscreens are not totally mineral per se and contain unregulated SPF components: https://www.youtube.com/watch?v=_Lcakmug-c0
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I wonder why no one mentioned Tranexamic Acid. It was mentioned in one of the recent Beauty Brains talks from Perry and Valery
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If you check the washes on the market you’ll see that they don’t use Citric Acid, but Lactic Acid instead. And the pH is lower than skin pH, around 4.5 (or I’ve seen even lower)
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Formalin? 😨 Is it even allowed in skincare?
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Obviously the wrong thing with the formula is that it doesn’t have any percentages and manufacturing process
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I heat the SA with propanediol 1:15 ratio and then I mixed it with water
Solubility of SA is affected not only by amount of solubilizer, but other additions too. When you add water you decrease the solubility. When you have pure propanediol - you have very high solubility. When you have water+propanediol mix your solubility of SA in it is different. There is a whole study on how to calculate solubility in a mix of solvents: https://pubmed.ncbi.nlm.nih.gov/16649546/
I wrote an article on reddit on how to formulate SA in DIY based on my experience, commercial products and studies. It also contains few formulas: https://www.reddit.com/r/DIYBeauty/comments/1d22zx8/formulation_guidelines_for_salicylic_acid_2_serum/
pubmed.ncbi.nlm.nih.gov
To show the applicability of a solution model, i.e. the Jouyban-Acree model, for predicting the solubility of a solute in ternary solvent systems based on model constants computed using solubility data of the solute in binary solvent systems, the solubility … Continue reading
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The original tale about lactate buffer started (I assume) with this paper: https://pubmed.ncbi.nlm.nih.gov/25043489/
But the problem is that Urea is most stable at pH 6.0 and decomposes to ammonia, which is basic. So you need an acidic counterpart to neutralize it. Lactic acid has pKa of 3.8. At pH 5.5-6.0 there is almost none Lactic acid in the buffer to neutralize ammonia in case of pH drift.
The paper is also criticized and its issue is described in this discussion on this forum: https://chemistscorner.com/cosmeticsciencetalk/discussion/urea/
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Yes.
The oils definitely create an occlusion, but this layer is not bulletproof. It will prevent the absorption, but can’t hold it over time. You can experience it if you apply some oily product and then the TO suspension. It will sting over time when it reach the water in your face.
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I suspect “Xanthan Gum Transparent” is another name for Soft grade in your suppliers list.
I assume the reason it bubbles is the very high amount of HEC. The product is just too thick and bubbles can’t get out
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This reply was modified 2 months, 2 weeks ago by fareloz.
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This reply was modified 2 months, 2 weeks ago by
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Xanthan Gum has different grades. You need Xanthan Gum Soft. And definitely not the food grade.
Why do you even want to hydrate HEC? Just put it to oil phase, it gonna hydrate itself during emulsification.
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As I said it doesn’t matter what your base is because you don’t have right equipment to disperse the filters. It is just out of reach for DIY. So I promise your result will be 100% failure no matter what DIY technique you have in mind. And since the reliable testing for SPF costs a lot and burns real persons I would strongly encourage you from doing DIY sunscreen because it will fail, you will loose money and hurt people for nothing.
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As I answered you in another post - drop the idea of DIY SPF product. Unless you have high end equipment to make and test the product you will never be able to reach any reasonable SPF. The danger here you will think it works while it doesn’t.
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I have a hunch the comment is just ChatGPT generated
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Indeed, ascorbic acid requires acidic pH. But Vitamin C is a general term for many ingredients. There are ascorbic acid derivatives that are stable at neural pH