I’m guaranteed there are plenty of choices but I’ve discovered Alcoholic beverages ink or acrylic paint to get The 2 most straightforward solutions! Alcoholic beverages ink is definitely a more clear type of coloration but acrylic craft paint doesn’t bond beautifully to every kind of resin so you’ll should experiment https://epoxyresincuringprocess16925.mybjjblog.com/top-guidelines-of-epoxy-resin-art-44482821