The Tropical mix is combination of nothing but rich transparent colors, including Jade Green, Cerulean Blue, Gold Ruby, deep Purple, and Gold Topaz. Bob swears that he remembers a Tropical mix of Lifesavers at one time that used the same exact colors.
Since each Float is absolutely unique, there will be some variation in appearance. Below are some photos of Floats of various styles over time with these colors, to illustrate what kind of range there might be: