Is it safe? Even though Crayola does not publish a detailed and specific ingredient list, they do formulate their crayons so that toddlers can eat a whole box of the stuff without suffering anything more serious than a stomach ache. Crayons consist mainly of paraffin wax and non-toxic pigments. Wax is a major component in any lipstick or chapstick, and crayons' pre-mixed pigments will give you more choices, at less cost than either food coloring (I've tried that too) or the powders and gels cosmetic suppliers will sell you.
This recipe works surprisingly well. The colors last longer, and stick to your lips better than regular commercial lipstick. No need to worry about evidence left on shirt collars, or on cigarette butts carelessly left in ashtrays... although sometimes, depending on the specific crayon color, the pigments might need a little extra smacking of the lips to disperse evenly.
If you're using a chapstick tube (or a lipstick tube of a similar size) and you're making this as a gift, you can download a pop-up, pop art lip balm holder I designed. The template comes in two versions, one with text and the other with an empty speech bubble in case you want to add your own.
Step 1: Containers and molds
If you really want the real lipstick shape, you can buy molds at various suppliers. Most of these vendors cater to people who are making cosmetics for sale and not for personal use, so they sell trays with fifty or so molds, but Making Cosmetics sells a three stick mold. I decided I could do without the pretty shape, and stick with something easy and cheap. A good source for chapstick and other containers is called Specialty Bottle. They do not sell lipstick molds but they have a nice selection of tins, jars, and bottles, and no minimum quantity. Many other vendors sell similar items, and I'm not endorsing (or affiliated with) anybody.
Step 2: Ingredients and materials
The following quantity will fit easily into most lip balm tins, but you will have a little left over if you are using a tube, which usually holds only 0.15oz. For the triple lipstick mold, double the recipe.
I have tested a variety of different ingredients, and although the end product varies in "feel" you have a lot of flexibility in your choices.
Here is the basic recipe:
1/2 crayon of your favorite color (approx 2.4g)
1/2 tsp jojoba oil (approx 2 g)
1 almond-sized chunk of shea butter (approx 2g)
Ingredients you can add to the above:
1 pea-sized dab of lanolin (improves feel and possibly color distribution)
1 pinch gum arabic (improves color distribution and durability of color)
1 drop vitamin E (helps prevent oil from becoming rancid, improves shelf life)
1 pinch zinc oxide (makes color lighter and more opaque, offers protection against UVA and UVB sun rays -- but make sure your wax mixture is well stirred before you pour)
You can replace shea butter with cocoa butter (will make lipstick slightly more firm)
You can replace jojoba oil with castor oil (will make a glossier lipstick)
These are the alternate ingredients I've tried, but there's no reason you can't experiment with any other type of edible oils.
Step 3: Melting and pouring
As soon as all the ingredients are melted and well combined, pour them into your containers.
If you are using the slanted lipstick container prop it up in some rice, beans, or popcorn kernels like I did. This will allow it will set at the proper angle.
Wax contracts as it cools, so you will get a dent, or maybe even a small hole in the center of your tube. You can reduce this effect by tapping the container on the counter as it cools, but if you try topping it off with more wax chances are the extra drop you add will come off when you use the stick. I have a theory that plunking the tube in a cup of hot water and letting it cool super slowly would help too: if the sides cool at the same rate as the center, no hole should not form, instead the whole level would go down a bit. Putting it into a warm oven (turned off) might help too. I haven't had a chance to test out this theory yet... I'll keep you posted.
Step 4: Application and uses
After making my first few colors what should have been obvious from the start finally struck me: this doesn't need to be just lipstick, it can be used as rouge, or face paint! However, I do not recommend using this to paint the area around the eyes. Some pigments are approved for lips and skin but not for the eyes, and since the specific ingredients are not listed on the crayons I would not risk it.
Update: jfarn01 had a great idea which I want to point out here. Crayons can also be used for making colored shoe polish -- it just so happens that I had already posted a recipe for shoe polish here. Just replace the candle in that recipe with 3 crayons of the color of your choice, and you can finally have a polish which matches your shoes.
For up to date news on what I'm cooking up, check out my new blog.