Slippery History

Soap: The Basics

Soap is formed when an acid, derived from the fats and oils of plants and animals, is combined with an alkali. Today most soapmakers use commercially available alkali such as sodium hydroxide (caustic soda) or potassium hydroxide (caustic potash). When the fats and the alkali are combined, a chemical reaction called saponification occurs. And there you have it: soap.

And how does it work? Water has a property called surface tension. This tension is created as water molecules at the surface are pulled toward molecules at the bottom. Soap molecules have a head that is attracted to water and a tail that is attracted to dirt. The tail embeds itself in the dirt, and the head pulls itself toward the water, breaking the surface tension. When you rinse off, you wash away the soap molecules along with the dirt their tails are clinging to.

The History of Soap

Soothing, Simple Soaps

To make this soap, first purchase a solid, translucent glycerin soap base (available from SunFeather Natural Soap; (315) 265-3648; or at sunsoap.com). Melt it gently in a double boiler over medium heat. Add soothing botanicals, fragrant oils, and any other ingredients that please you, and stir. Then pour the thick liquid into a plastic soap mold or a plastic food storage container and let it cool.

LAVENDER & ROSEMARY SOAP

3 cups glycerin soap base
1/4 cup infusion* of lavender flowers and rosemary leaves
1 1/2 teaspoons lavender oil
1/2 teaspoon rosemary oil
1 teaspoon pulverized dried rosemary (optional)

Combine melted base and botanicals. Stir until blended, then pour into molds and cool.

*MAKE AN INFUSION:

Infusions are delicate teas made by pouring hot, steamy nonchlorinated water over fresh or dried plant parts. Three tablespoons of dried or fresh herb per cup of water, steeped 10 minutes, will suffice.

—Reprinted with permission from Soothing Soaps, by Sandy Maine (Interweave Press, 1997).