Many canned goat's milks are evaporated. To make regular strength goat's milk, you add an equal amount of water. Using evaporated goat's milk in your soap is sort of a combination of using the fresh and powdered.
- First, make your lye solution using half of the water called for in the recipe. (This may not work well if you heavily discount your water already.) For example, if your recipe calls for 8 oz. of water, make it with four. Be very careful with this solution, for it will be very strong. If the lye doesn't dissolve completely, you can add a few more tablespoons of water, a bit at a time, until it's all dissolved.
- Use goat's milk for the other half of the liquid called for in the recipe. So, if your recipe called for 8 oz. of water, use 4 oz. of water to make the lye solution, and set aside 4 oz. of evaporated goat's milk to use later. I like to freeze my evaporated goat's milk in ice cube trays ahead of time. It makes it easy to measure out just the right amount. (You'll want to let it melt/come to room temperature before you add it to your oils though.)
- Prepare to mix your soap like you normally would, but when it comes time to add the lye solution to the oils, add the liquid goat's milk first. Stir it well.
- Then the double-strength lye solution to the mixture and mix until it reaches trace.
You may get a little bit of orange color shift using this method (some of it from the color of the goat's milk itself)...but not too much.