If you work with leather and would like a super cheap way to dye it black check out this tutorial for making vinegaroon. All you need is some vinegar and some steel wool or you could use steel shavings or even some rusty nails. You will need leather that has been vegetable tanned because the vinegaroon reacting to the tannins from the vegetable source is what will turn the leather black.
The nice thing about the vinegaroon is that after you make it you can dye leather with it and then pour it back into a jar and it will keep pretty much forever. You may have to add more steel wool and vinegar from time to time but you need never throw any of your vinegaroon out. CARACODA shares the tutorial for making it on Livemaster.
Adam’s Leather Works also tells how to make it and he suggests that after dying you need to stop the process by neutralizing the vinegaroon by “soaking the leather in a mixture of 1/8th cup of baking soda to 1/2 gallon of warm water. Let the leather sit in the solution for a few minutes, then rinse thoroughly under running water. This is an extremely important step, so please don’t forget to neutralize the vinegaroon in your leather!” I don’t work with leather but found this method of dying leather very interesting and for folks that do work with leather this is a super inexpensive way of dying it black.
Click here for tutorial>>> https://translate.googleusercontent.com/translate_c?depth=1&hl=en&rurl=translate.google.com&sl=ru&tl=en&u=http://www.livemaster.ru/topic/335317-vinegaroon-chernyj-krasitel-dlya-kozhi-deshevo-i-mnogo%3Fmsec%3D134&usg=ALkJrhifOw4v4GZxTbQeWrsPKugdVBSlOA