Thanks for the advice...I guess I figured that coffee and tea cups could take the heat, so to speak. And I'm really doing this because I love the look of the cups as much as I love the fragrance of the candles. But I'm not going to market these or anything...just for friends and family right now. I've burned two so far for a few hours, and they did OK. I am going to tell people not to let the wax burn all the way down though, just in case.