I'll be ordering a goo kit shortly. I have a question about colouring the lamp. I presume that the colours that come with it are for the wax. I notice that the pictures of lamps using the goo kit show the wax being pretty transparent. Can you make it more opaque? Also, if you use distilled water, can you just add normal food colouring to give the liquid a bit of a tint? Will this colour work, or will it affect the goo? I'd like to make one with yellow liquid and dark blue goo. I don't mind the transparent goo, was just curious about options.