Cut four chunks from the soap base, and place them in a measuring cup.
Heat the chunks for roughly 35 seconds in the microwave.
Get your molds ready so they are handy to pour the soap base in after stirring in your chosen additives.
Stir the lemongrass essential oil into the melted soap base chunks. The lemongrass will give a slight yellow tint to the soap base.
Stir in any soap colorant you wish to use now. Follow the directions on the package to determine the amount to be used.
If you want a decorative flourish of rosemary exposed on the surface of the bar of soap, sprinkle it into the empty molds now.
If you want rosemary to be suspended inside of a glycerin soap, fill half of the mold with the melted soap base, and sprinkle the rosemary on top of the still very hot and melted soap base. Allow this half bar to cure to several hours at room temperature on the counter or for approximately a half an hour in the refrigerator. Once it has cured you can fill the rest of the mold up with more hot melted soap base until it is full.
If you simply want to have the rosemary to be contained inside the entire bar of soap, mix the dried spice in with the hot soap base, and stir to combine completely before pouring it into the molds.
