Melt together all of the ingredients, except the iron oxide pigments, over a double boiler until melted.
Combine everything together, stirring well, and slowly adding in the iron oxide pigments until you get a color that works for your hair. In my case, I added around 50% brown and 50% black iron oxide pigments, and it works very well for my color, but you may have to play with using yellow and/or yellow iron oxide pigments too to achieve the right color for you.
Prepare the lipstick mold, if you're using it, by putting together both halves, and holding them together with rubber bands.
Pour the mixture into the prepared lipstick mold (or lipgloss containers) while still very hot.
(If you are using lipgloss stick containers, let them cool and you are finished.)
As the mixture cools, it tends to make a bit of a hole in the center, which is why it's a good idea to pour in a bit more of the mixture than what you need to get to the top of the stick part of the mold. You'll be cutting off the excess product anyway.
To help make the unmolding quicker and easier, you can place your filled lipstick mold in the freezer for a few minutes.
Take the rubber bands off the lipstick mold, and pull both halves apart. Remove your homemade concealer stick.
Cut off any excess product from the base of the concealer stick.
Carefully push the product into an empty lipstick container, and you're done! You now have a professional looking homemade natural root concealer stick!
Lightly rub the concealer stick over the roots of your hair until any dark roots or gray hairs have been camouflaged. You can try rubbing the stick over the hairs in different directions to get them covered equally.