Useful How to make Black Ink

no. 136. how to make black ink.
(from Six Hundred Miscellaneous Valuable Receipts Worth Their Weight in Gold, by John Marquart, 1860)

Ingredients:

1 lb. logwood​

1 gallon of water​

24 grains bichromate of potash​

12 grains prussiate of potash​

Instructions:

Take 1 pound logwood, and 1 gallon of water; boil slightly, or simmer in an iron vessel one hour; dissolve in a little hot water 24 grains bichromate of potash, 12 grains prussiate of potash, and stir into the liquid while over the fire; take it off and strain it through a fine cloth. No other ink will stand the test of oxalic acid, and it is so indelible that oxalic acid will not remove it from paper.​