FOAMING BATH SALTS 
1/2 cup liquid soap(I use clear) 1 tablespoon light oil (like sunflower oil) 6 cups rock salt coloring 
Mix together soap, oil, and coloring. Pour this mixture over the rock salt in a large bowl. Stir continuously until the salt crystals are evenly coated. Spread the salts out in a thin layer on a cookie sheet covered with wax paper and allow to air-dry. This can take up to 24 hours. Put the bath salts into a decorative container when they are completely dry. 
To use :  Pour 1/4 cup of the salts into the bath under running water. Yields : 48 ounces, enough for 24 baths. 
****  I also used oil of essence for fragrance, and they turned out fine.