This was found at TSR board.
Posted by Prowler on October 18, 1998

I made one recipe each of these recipes tonight. The soaps came out perfect. I'll let you know in two days how the Bath Bombs came out. So far, they seem to be shaping up well.

Molded Soap
Melt one bar (about 4 ounes) of glycerine soap over medioum heat, stirring constantly.
Add about 8 drops scented oil and 1 or 2 drops liquid food color.
Pour hot mixture into mold and release when solid. I used a mold for floating candles.

Fizzing Bath Bombs (like the ones at Body and Bath Works)
Mix in small bowl 1/4 cup baking soda, 2 Tbls each cornstarch and Cirtric Acid. I used Fruit Fresh for the citric acid, as I was told this would work (same thing?)
Mix in tiny bowl 3 Tbls carrier oil, such as Sunflower or Almond Oil, 1/4 tsp essential or fragrance oil and abut 5 drops liquid food color.
Gradually blend liquid into dry mixture. This will resemble coarse crumbs.
Using hands, gently shape into balls about an inch on diameter. This will take some careful manipulation.
The balls should rest on waxed paper and be dry enough to use in about 24-48 hours.