Place the cubes in a saucepan over low heat. Stir often and melt slowly until fully liquid — don't let it simmer or boil.
Remove from heat and let it cool slightly.
Stir in sea glass mica a little at a time until you reach the shade you want.
Add the lime and spearmint drops; stir gently and fully to combine.
Stir in the poppy seeds, and keep stirring as the base thickens so they stay evenly suspended.
Pour into your mold(s). Spritz the tops with rubbing alcohol to pop surface bubbles.
Let set 4–6 hours (or overnight) until fully firm, then unmold and cut into bars.
Notes
*Mica powder is often sourced unethically, so it's important to find a good supplier. After a lot of research, I use Mad Micas.
The number of soap bars this recipe yields depends on the size of your molds, but you can expect around 8 standard-sized (4 oz) bars.
I use hemp oil melt and pour base from Bulk Apothecary for this recipe.
Work quickly! Once it's removed from the heat, the soap base starts to harden pretty fast, so you'll want to get it into the molds as soon as you can. If it gets too hard to work with, just add it back to the pot and melt it again.
Soap base can take a long time to melt down. The smaller you cut the cubes, the faster it will go.
Feel free to use any shape of mold you like — just make sure it's silicone, not wood.