Watercolour: https://www.jacksonsart.com/blog/2020/09/25/making-handmade-watercolours-with-jacksons-artist-pigments/
Tempera: https://www.royalacademy.org.uk/article/how-to-make-egg-tempera-paint
Inks: https://www.jacksonsart.com/blog/2023/04/03/making-natural-ink-process-recipe-yellow/
My own recipe for alcohol inks:
-
Pack a bunch of a colourful thing into a jar of 99% isopropyl alcohol, like avocado pits and skins, spinach, red cabbage, lemon peel, etc. Cover tightly and let sit in a warm place for at least two days.
-
When enough colour has leached into the alcohol, filter out the solids, discard them or use for another batch, and either let the liquids sit open in a warm place or set in a double boiler. Iuse the same jar throughout the process, usually putting a bunch of them in the water bath together. Slowly let the alcohol evaporate until the desired consistency is reached. I keep a brush and paper nearby to test every 15-20 min. Colour should be rich and dense. Usually doesn't take me more than two hours of double-boiling to reach a good point.
-
Mix in gum arabic solution, about 1 part to 3 parts ink. Test again.
-
You can keep reducing the ink, but at this point it will turn gel-like or hard if you evaporate all the alcohol.
Acrylic is a hard one to track down since it's a modern paint and most every company has their own secret formulation. It's a mix of glues, monomers, binders and solvents, and I haven't had any success trying to make my own from ingredients. In most cases it's cheaper and easier to just buy acrylic medium (paint without the pigment) to mix your own.
If you want to go deeper, and I can't imagine not wanting to discover hidden secrets, here's a whole paper on it: https://www.rroij.com/open-access/chemical-formulations-for-acrylic-matt-and-acrylic-gloss-paints.pdf