30 ounces of Soap Crafters Clear Glycerin Melt & Pour Soap
6 colors of soap making Liquid Colorants
Suggested colors are True Red, Orange, Lemon, True Green, Crystal Blue and Purple
Witch Hazel in a spritzer bottle
1/3 oz of soapmaking Fragrance
Small bread pan (7-1/2"long x 2-1/2" deep x 3-1/2" wide) approximately, but having straight sides.
A microwave & microwave safe bowl
A chopstick or spoon to stir

Put 5 ounces of Melt and Pour soap in a bowl. Microwave it for 30 seconds. Stir with a chop stick. Keep putting it back into the microwave until melted for about 5 seconds, being careful not to let it boil or overheat. Don't stir too vigorously because you will create foam. Add a drop of liquid colorants, If color isn't dark enough, add a little more.

When melt and pour soap is melted, add about 1/6th of the fragrance. Stir. Pour into the CLEAN bread pan. Remove any foam or bubbles which have formed. Put into freezer for 5 minutes or less. The top of the soap will be firm. Give the top of the soap a light spritz with Witch Hazel.

Melt your next color.
When melted and stirred evenly, set aside for a couple of minutes. A light 'skin' will form on the top of the soap. Stir in your fragrance and then pour on top of the previous layer. Put into the freezer for 5 minutes or less, until the top of the soap is a bit firm. Mist top of soap with Witch hazel.

Continue these steps until all of your colors are used. Remember to let the 'next layer's melted soap' sit until a skin forms before pouring it, otherwise the soap will be too hot and will melt the previous layers.

When the colors are all used, put the mold into the freezer for 20 minutes or so, up to an hour. The rainbow soap loaf will fall right out of the bread pan. Let it get to room temperature and slice 4 bars.

Added notes:
When we made this bar of soap, we used many soap making fragrances, one to match each color. This method adds a scent rainbow too! :)