In a large mixing bowl, thoroughly combine the baking soda, cream of tartar, and SLSA. Stir in yellow mica colorant until completely combined.
In a small container, combine the fractionated coconut oil, lemon essential oil, and Polysorbate 80.
Stirring constantly, slowly mix the liquids into the dry ingredients until they are completely combined.
Add citric acid to the mixture and stir until it is fully incorporated.
Test to see if the mixture is a moldable consistency - it should feel like slightly damp sand and hold together when squeezed in your hand.If the mixture is not quite wet enough to mold, spritz two to three times with a spray bottle of witch hazel and mix well. Repeat as necessary until the proper consistency is reached.
Press the bath bomb mixture firmly into the mold using your thumb and the palm of your hand to apply pressure. Fill the mold to the top until it is packed completely full.
Carefully release the bath bomb from the mold (tap the mold lightly with a rubber spatula to release suction if needed) and allow it to dry completely for 24-48 hours depending on the temperature and humidity of your location.
When the bath bombs are dry and hardened, mix together 1/4 tsp of green mica colorant (in one or two shades of green) with 1/2 tsp of isopropyl alcohol. Use a paintbrush to add leaf detailing to the bath bomb.