Saturday, October 26, 2013
Weekend Wonderings: Do we need preservatives in anhydrous products? How do we use glycerin as a silicone substitute? And how to do I add water soluble things to anti-frizz sprays?
In this Newbie Tuesday post on lotion bars, AZ asks: Do we need to add any preservative to them? Or all oil only creations do not need preservatives?
No, we don't need to add preservatives to oil only products. We add preservatives to water containing products because the beasties that grow in our products will need water to live, so those that don't contain water don't need preservatives. You can add anti-oxidants to your anhydrous or oil only products in the form of rosemary oleo resin or Vitamin E, but you don't need to add preservatives if they are not going to be near or contain water.
Can I point out how happy I am that you want to preserve your products? Yay!
When do we add a preservative?
Back to the very basics: What we need to know about making any product, part 1
Someone asked me how to do this in an e-mail I can't find at the moment. You don't. Glycerin is a water soluble ingredient that draws water from the atmosphere to your skin or hair. Silicones are oil soluble ingredients that create a layer of emolliency on your hair or skin and keeps water out. Using glycerin in the place of silicones will do the exact opposite of what you want and will make your hair feel really sticky and horrible.
If you want a substitute for silicones, you can use various oils to get that emolliency or you can use a silicone substitute, depending upon your goal. I've heard that broccoli oil is a good subtitute, but it has a broccoli smell to it, which means it won't even make it through the front door of my house so I won't be testing it out in my workshop!
In this post on anti-frizz sprays, Marjolein asks: I really like this frizz spray but now am looking to add silk to it... And there my knowledge stops. Liquid silk is waterbased so i guess i have to use an emulsifier now...BTMS with silicones as i learned from your blog. How would you reccomend for me to adjust the silicon spray to incorporate a bit of waterbased ingredient? Thank you in advance!!!
You're right. To add a water based ingredient to an oil soluble product, you have to add an emulsifier. But the moment you add BTMS to this product, you've turned it into a conditioner, not an anti-frizz spray, so my suggestion is to leave this one alone and get yourself a good leave in conditioner recipe you like and add your silk to that.
How do you add an emulsifier to this product? I wouldn't. I'm not saying you can't, but by the time you add the emulsifier, add some water, add the silk and preservative, and so on, you have a leave in conditioner with a ton of silicones and you don't have a silicone spray any more.
Join me tomorrow for more Weekend Wonderings!