Store in a cool dark place. Place over a saucepan of boiling water. While still warm, pour into dark ointment jars. Leave to set in a cook ,ark place. Keep for up to a year.
Creams are an emulsion of oil and water, easily absorbed by the skin.
A convenient way of making it is to buy an emulsifying cream from a drugstore and heat the plant material in it. Melt two tablespoons of emulsifying cream over a low heat. Add two teaspoons dried or fresh herbs. Stir until cream takes on the colour of the herb. Removed from the heat.