Set up a double boiler on your stop top. If you don't have one, fill one large pot with water and bring it to a boil, then set a smaller pot in the water. The water will heat up the smaller pot to create a double boiler effect. This way, you don't burn the glycerin.
Add ½ lb. of clear glycerin soap to the top pot or the double boiler and allow it to melt completely. When the glycerin base is completely melted, add ½ tbsp. table salt and ½ tbsp. of your favorite fragrance oil. Many recipes recommend a peppercorn fragrance to create a salt and pepper effect, but you can use whatever works for you. Stir to mix all ingredients together and enjoy the sweet smell.
Pour the mixed glycerin into a rectangular soap mold or drawer divider until it is about ¼ inch thick. Sprinkle ¼ cup of sea salt on top of the soap and allow everything to cool. You can set up the next part of the recipe while this cools.
Clean out the double boiler, and then activate it again. Melt ½ lb. of white glycerin soap in the double boiler. When it's all liquid, add ½ tbsp. castor oil, ½ tbsp. beeswax, ½ tbsp. of your fragrance oil and 2 tbsp. poppy seeds and stir it all in.
Pour the mixture on top of the original soap. Allow it to cool completely, so it sticks to your original batch and forms one large, rectangular bar of soap. Once everything cools off, you can start washing with your homemade soap.