This Watermelon soap doesn’t contain watermelon instead it is made to look like water melon. In case you hadn’t already guessed this soap uses transparent Glycerine soap base. You can grab the tutorial and full recipe here. Watermelon Soap
If you are new to soap making you might like to check out these Melt and pour basic recipes and tutorials on our sister site.
Here is our favorite stockist of melt and pour soaps. (Affiliate link)