1 Gram Rosin, crushed up into little pieces
1 drop Humectant P-20
10 – 15 ml (1 teaspoon) azeotropic alcohol
Can be mixed at different concentrations based off of use (makes for thicker or thinner layers)
A long lasting oil can be added, such as 1 drop of machine oil to make a stickier solution when dry.
Mix and let the rosin slowly dissolve, may require agitation to dissolve.
This solution can be removed with alcohol on a rag.

80      Red Iron oxide
10      Cobalt Carbonate
10      Chromium Oxide
2      Gerstley Borate (for working below cone 6)

If you have speckling issues or grain issues try using yellow iron oxide.
This stain is usually not a perfect black on the first attempt,
these materials tend to vary across batches so some adjustments are required to get the color match you want.

1 teaspoon sodium bicarbonate
1 cup of warm water
Place the sodium bicarbonate and water solution into a shallow plate.
Soak the receipts in solution for 5 min.
Briefly soak in a pure water solution.
Carefully hang dry paper, or place in between blotting paper and press flat to dry.
Updates coming on long term reactions on paper this was experimented on with.  (4/29/2019)
As of (2/21/2020) there is no fading or deterioration of the paper, paper does not react to heat. 

1 1/4 cup damp toilet paper that has been shredded apart
1 cup drywall compound (not DAP brand, walmart brand is best)
3/4 cup PVA glue (elmers glue all)
1/2-1 cup white flour
9.5 ml of Optiphen (preservative to prevent rot)
Mix until the desired thickness is achieved, It is advisable to make a thin and thick batch to allow for more versatility.

This recipe should be resistant to rot.

Original recipe sourced from

12ml azeotropic alcohol (foodsafe)
10 drops essential oil (foodsafe)

Alternative recipe

6ml Glycerin
6ml Polypropylene Glycol
10 drops essential oil

This second recipe can be used to make vape fluid, be sure to use an oil that is safe to be inhaled into the lungs.