[Syl]

@Perry- Agreed, Paprik’s perception is not necessary wrong, but intuitively I was unsure of his statement because of my education, and personal experience. This article on biophysical properties of the skin between men and  women which says sebum content is higher in men because sebum is highly influenced by sex hormones might explain the perception difference.
 https//www.ncbi.nlm.nih.gov/pmc/articles/PMC6116811/

[Syl]

In my experience, some vendors are not following shipping rules. When I buy lactic acid or sodium hydroxide in large quantities, some vendor will charge a hazmat fee, some do not.  

[Syl]

Hi Tyss, COSMOS is the European standard for Organic and natural products in cosmetics. Soaps are not considered cosmetics, so I am not sure if this standard can apply.
If it does: when you make soap you no longer have any caustic soda left in the soap. The end results of the saponification reaction of the oils with caustic soda which is diluted in distilled water will give you: % sodium soap (sodium palmate, sodium cocoate, sodium olivate….) % glycerin, % water, % free fatty acid (super fat), % various additives.
These are the percentages you need to calculate.

[Syl]

It is as much science as it is art, and I love this aspect. The downside is the muddied marketing which preys on human frailties.

[Syl]

I agree with Perry. If our skin had a sebum sensor, we would never suffer from dry skin.

[Syl]

These zwitterionic surfactants display a negative charge at high-pH values due to charge domination of the carboxylate group.55 They are positively charged at low-pH values due to the charge domination of the amine group. The isoelectric point is the pH at which the negative ionic charge of the carboxylate groups is exactly counterbalanced by the positive ionic charge of the alkyl ammonium groups. Streaming potential measurements of micellar solutions of betaines show that the isoelectric point is greater than pH 9 for C12-14 alkylbetaines. When alkylbetaines are mixed with sodium lauryl ether sulfate, the ionic attraction between the positively charged betaine headgroups and the negatively charged sulfate headgroups cause a dramatic increase in the packing factor of the mixed micelles. The isoelectric point of micellar cocamidopropyl betaine is 6.25. Therefore, at pH 5.5, cocamidopropyl betaine is slightly positively charged. This charge is just enough to confer an increase in packing factor on sodium lauryl ether sulfate micelles to ensure that the mixed micelles are wormlike, and, therefore, they exhibit a “thickened” rheology. On the other hand, cocamidoethylbetaines have an isoelectric point (IEP) of less than pH 3.5, which means that this cosurfactant is essentially negatively charged at all pH values above 3.5. It has been proposed that this low IEP is due to the formation of six-membered ring conformation that brings the carboxylate group into the direct vicinity of the amine group, thereby effectively neutralizing a proportion of its charge. Correspondingly, cocamidoethylbetaines are less efficient “thickeners” of anionic surfactant compositions.

[Syl]

I agree, as a rule you should not use a drying shampoo. It has just been my experience that a minority of people needed a stronger shampoo. Some of those people might also have a scalp condition and really need a medicated shampoo. I use 10% coco-glucoside, my shampoo bars contain 70% surfactant. 

[Syl]

@Abdullah, I agree with Paprik.
I sell shampoo bars that contain SCI (sodium cocoyl isethionate) ,coco glucoside and SLSA ( sodium lauryl sulfoacetate). The combination is mild and works great for most people.

Many other shampoo bar company target a younger audience that is why they include coco-sulfate or SLS because young people tend to have more sebum and need stronger cleansing. I also include coco-sulfate in my deep cleansing bars.
I would recommend that you test your shampoo on teenagers with long hair. 

[Syl]

I refrigerate all liquid oils since they are more susceptible to rancidity. I would do as Graillotion, but my fridge is not large enough for coconut and palm oils 1 gallon containers.

[Syl]

My personal finding is that young people with long hair who wash their hair 1-2 times per week usually need more surfactant. I had to formulate a deep cleansing formula for those customers. My basic mild formula works well for the average person.

[Syl]

It all depends… how fast you use the oils? How fresh they are and how susceptible they are to become rancid.
Rosemary antioxidant is used at less than .5%.
https://www.newdirectionsaromatics.com/products/preservatives/rosemary-antioxidant-co2-extract.html

[Syl]

Without knowledge of any details, it is difficult to offer an opinion. Standard business agreement rules should apply to your situation.
Before buying a service, a professional company should provide you with a contract listing what they will provide for you at what cost with deadlines.
As a client, you deserve to know when they will deliver and what they have accomplished so far. If they are not delivering on their original promise, you should have the right to a refund.

[Syl]

I like the Oakton brand, they have many models with different specifications. If they are marketing it for soil or water does not matter, what is important is that they meet the resolution and accuracy that your application requires.
Example:
Range0 to 14 pHResolution0.1 pHAccuracy±0.1 pHCalibrationUp to 3 pointsATCYesTemperature32.0 to 122.0°F (0.0 to 50.0°C)PowerFour A76 1.5 V miniature alkaline batteries (included)

[Syl]

I like Jojoba oil in lip balm and lotion. I love rose geranium EO in wash products. 

[Syl]

Usually, you find unrefined/cold pressed versus refined which is processed to remove odor and color.

[Syl]

Green soap: vegetable oil, oleic acid, KOH, glycerin, water: These are almost the same ingredients that make up castile soap, not sure why they call it green soap. The only difference is the addition of oleic acid which is found in some vegetable oils. 

[Syl]

This question was already answered in a previous post.https://chemistscorner.com/cosmeticsciencetalk/discussion/5134/is-l-ascorbic-acid-soluble-in-1-3-propanediol
According to Mark Broussard
Yes, Ascorbic Acid is soluble in 1,3-Propanediol at up to 17%.  Much more than that would be pushing the solubility limit and you’ll get some precipitate.

[Syl]

Acccording to petmd the best solutions are:
https://www.petmd.com/dog/conditions/all-about-dog-warts-types-causes-and-treatments
VCA says:https://vcahospitals.com/know-your-pet/papilloma-of-the-skin
bottom line you want to visit the vet.

[Syl]

All approved ingredients are safe to use, but some can cause problems in a small percentage of people. We are complex living organisms; think of peanut allergy and apply this concept to cosmetic ingredients. When it comes to preservatives they are a challenge, but they make our beauty product safe. 

[Syl]

@ Stanley, after perusing through the links Phil Geis generously provided. It appears that only companies generating over $1,000,000 in sales annually have to report. If your company is large they have more links and info on how to report on the link below.
https://www.cdph.ca.gov/Programs/CCDPHP/DEODC/OHB/CSCP/Pages/OnlineReportingFAQs.aspx

[Syl]

The company that makes that natural cream is not listing its ingredients according to FDA labeling regulation. What is a natural preservative? Is it phenoxyethanol Ethylhexylglycerine? 
As a person who suffers from eczema, I would recommend an over the counter hydrocortisone cream to reduce the discomfort at this point, and I hope you find a hand cream that does not cause blisters. It is best to select a product that list all ingredients according to INCI regulation.

[Syl]

@justaerin thank you!

[Syl]

You can solubilize your EO with polysorbate 20.

[Syl]

Most EO I use are labeled prop65, this is also a liability.
 https://www.natlawreview.com/article/california-ramps-chemical-bans-disclosure-obligations-personal-care-and-beauty

While SB 312 does not ban any chemicals for which reporting is required, the law creates an incentive to reformulate because citizen enforcers under Proposition 65 (The Safe Drinking Water and Toxic Enforcement Act of 1986) and personal injury plaintiffs can review the DPH website for litigation targets.

[Syl]

Tisserand says you need to dilute your EO; you can dilute in carrier oil 1% or you can dilute in shampoo 1%, it is the same principle. Actually EO is safer in rinse off product than leave on since the EO will be washed off.