Saturday, August 20, 2011

Using Preservatives in Your Handmade Bath & Body Products

I love handmade bath and body products. Even though I make them myself, I often indulge in the delights that other soapers come up with as well, because handmade carries the personality of the creator. Sometimes, I want the soap of someone with a sweeter personality than mine. Or just someone who doesn't swear like a biker. So I do cruise the interwebs looking for awesome stuff, and I find it, yay! But in the search, I find OTHER THINGS too.
I've already posted here about the super hippie preservative free lotions available. All natural means bacteria and fungus. They're natural too, but I don't want that much nature in my lotions. I love a little preservative. I said a LITTLE!
That's what this post is about. Overuse of preservatives. I have a list here, with the most common preservatives, their INCI names, usage rates, and effective pH range:

Optiphen - Phenoxyethanol (and) Caprylyl Glycol, 0.5%-1.5%, no pH restrictions

Phenonip - Phenoxyethanol (and) Methylparaben (and) Ethylparaben (and) Butylparaben (and) Propylparaben (and) Isobutylparaben, 0.5%-1.0%, pH 3.0-8.0

Germall Plus Liquid - Propylene Glycol (and) Diazolidinyl Urea (and) Iodopropynyl Butylcarbamate, 0.1%-0.5%, pH 3.0-8.0

Germaben II- Propylene Glycol (and) Diazolidinyl Urea (and) Methylparaben (and) Propylparaben, 0.3%-1.0%, pH 3.0-7.0

Tinosan SDC - Silver Citrate and Citric Acid, 0.1%-0.5%, pH less than 7.0, this preservative should be used with Potassium Sorbate to prevent growth of fungus.

Potassium Sorbate - Potassium Sorbate, 0.1%-0.5%, pH less than 6.0, not a broad spectrum preservative, most effective against fungus.

When reading the MSDS and Technical Data Sheets on these preservatives, one thing that really jumped out at me was a recurring phrase: wear protective equipment, including respirator, goggles, and gloves. Why? Because all of these, for lack of a better term, are poisons, and they kill bacteria and/or fungi. In large enough quantities (which for some of these is not very large), they can harm you too. And if used to excess in products applied to the skin, they can cause irritation and rashes.

What has me a bit worried, is that I see products with the preservative listed higher in the ingredient list than fragrance. This is a problem because in a best case scenario, the manufacturer doesn't know that you should list ingredients in order, by weight, from highest percentage to lowest. In a worst case scenario, it's a terrible problem, the manufacturer is using more preservative than fragrance. Now, fragrances and essential oils used as fragrance have varying rates of safe usage, but typically, that rate is anywhere from 3-10%. Some are even safe at 100% concentration, like anise, cedarwood, and fennel essential oils.
Anyhow, the preservative amount is so tiny, it should always be the last ingredient on your list. Tiny, tiny, tiny. Usually less than 1%. Never, ever as much as 2%, which is what one body butter I saw tonight claimed to have. Two percent of a preservative that should be used at no more than 0.5%, and can be effectively used at 0.1%. So that body butter had 20 times the amount of preservative that was needed, and four times the amount that is safe. I know that math isn't everyone's forte, but it's important to have the math skills necessary to safely formulate B&B products if you sell them. To figure out the amount of preservative you need, if it's given in a percentage, you need to move the decimal point two places to the left to get the correct multiplier. If the percentage given is 0.5%, then your multiplier is 0.005, or in fractional form, 5/1000. Multiply the total amount of your recipe, let's say 1000 gm of water, 300 gm of oils, and 100 gm of emulsifier, by the multiplier. In this example:
(1000gm + 300gm + 100gm) * 0.005 = 1400gm * 0.005 = 7gm
Translated into ounces, that's 50 ounces of lotion, with .25 ounces of preservative. 1/4 ounce in 1-1/2 quarts.

Another option, is to make butters with no water, aloe, or other water bearing liquid - bacteria and fungus need it to grow, and can't grow without it.
And you can get a respirator at Home Depot or Grainger (for example) for about $30.00, and it's something that I highly recommend. Safety first!

Tuesday, August 09, 2011

New Fall Lines in Both Shops!

I've been in a creative frenzy for a couple of weeks now, and it's awesome! I created a new pattern for a crochet witch hat (available here), it comes together so quickly! I can make a couple of these hats every day, but I was distracted by fall leaves. I'm on a scarf now, basically a brown skinny scarf with fall leaf embellishments, lots of leaves!
I've also made some Autumn scents for my soap shop, pumpkin lavender body gloss, several sugar scrubs, and the Fall/Winter lip balms. I will also have the body butters available again in two weeks - completely water free, and made with organic raw shea butter, and organic cocoa butter. I'm just waiting on containers! I tore through my last order of jars making hand & body creams and scrubs. I ordered tins for the new body butters, they're very nice, and will be great for gifting.
My Etsy Anniversary sale is still going on in my soap shop, 25% off everything with coupon LUGH11, the last day for bargains will be August 14th. If you have any special requests, now is the best time before the holiday shopping season starts, I've already had requests to restock the Detox Soap and Winter Skin Rescue Soap. The Detox Soap is available now, Winter Skin Rescue will be back next week. I'm not listing full sized loaves in my Etsy shop, but if you'd like a 40 ounce loaf for your gift baskets, you can e-mail me at, full loaves will be $28.00 plus shipping, invoiced through paypal.