In a small saucepan or mini sauce crockpot, place first four ingredients and heat until completely melted.
Mix in activated charcoal and remove from the heat.
Place mixture in a plastic bag, allow to cool a bit, and move contents to one corner of the bag.
Cut a small hole at the corner, insert into empty sterilized mascara tube, like this one, and gently squeeze mascara into tube. It will be much easier if you have a second pair of hands to help.
Notes
Because this mascara is all-natural and contains no preservatives, it lasts 3-4 months. Dispose of after that, or if it starts to smell funky. You could probably put a few drops of vitamin E oil in and put a little less coconut oil in to helpĀ preserveĀ it.