For those of you who must just have BLACK and are not satisfied with the hue of Graphite, purchase up to three (one ounce) bottles of Bombay BLACK India Ink and mix with a whole quart of Graphite.
For a whole quart of paint- add 3 bottles of India Ink (1 fluid ounce each) to Graphite, then mix really well together.
If you have a sample pot of Graphite- which is only 4 ounces of paint. Add just a little LESS THAN HALF of one bottle of India Ink.
Carefully pour ink to your paint. It will be watery- so again- be careful. First- when incorporating- FOLD the ink into paint. Once fairly well mixed- feel free to stir it. Just do not be sloppy. : )
Just a note of caution....the more outside ingredients you start to add to a product- it will start to play with the integrity...but this is an option to use and I like the outcome!