In reading this they gave tips on coloring the Epsom salt and either mixing with the rest of the mixture or sprinkling in the bottom of the mold which would end up being the top of the design. I used two essential oils for each batch. I cannot for the life of me remember both, I did label them when I wrapped them. Since they were gifts I do no have them anymore. I made rose shaped ones, I colored the salt red and lime green. Even after mixing and letting it sit before mixing everything together it the colors still blended. One of the scents used was lavender along with one other scent, for the rose shaped. For the other flower shape I used peppermint along with another that I cannot remember.