candy clay and modeling chocolate is the same. you melt your chocolate in microwave or over a double boiler. then add so much clear corn syrup or glucose to it, stir , it changes texture and then pour out on pan covered with wax paper or so. and let set up. Merkens chocolate disk are also great for this. wilton candy disk also. some people use the high end chocolate that you have to temper . some use the chocolate chips. you can make beautiful flowers. figures, etc. with this modeling chocolate also. some people cover their cakes with it , just like you use fondant. this mixture is also called chocolate plastique.