Pick out the pigment (colors) you want to use for your project. I have listed the colors I used in the material list above if you want to attempt to get the same type of colored effect I got in my resin geode coasters. On your silicone craft mat, within reaching distance of your molds, lay out a row of silicone or plastic cups. Paper will work, but it is hard to reuse them. Silicone and plastic materials will always be the most cost efficient and environmentally friendly(because we can recycle them over and over) materials to use for resin crafting.
Put a dime-size amount of each pigments into each cup.
Note: Remember to put your pigments into your cups before mixing your epoxy! This gives you more time after mixing your epoxy, which is valuable as a beginner. Before you get used to only having a limited amount of time to work before your epoxy starts to harden, little tips like these make all the difference and will prevent major frustration, as well as waste. Committing to your color choices before hand also protects against indecisiveness, leading you to commit to your colors before you even think about mixing up that epoxy and starting the clock!