India ink is one of the best for black and white inkwork, it gets the darkest lines with just one pass. Use with a pen & nib set or brush!
Made from highly opaque, carbon black pigment, this ink offers excellent reproduction quality on absorbent surfaces with optimum lightfastness. 
Speedball Super Black India Ink
You can purchase the best Speedball Super Black India Ink-16oz 956 for sale at unbelievable prices on our site
Speedball Super Black India Ink, 2-Ounce
Speedball Super Black India Ink – Jerrys Artist Outlet
Speedball® Super Black India Ink
Ink (2 fl oz) – Camp Flintlock
How to use India ink to dye oak? Do I dilute it with water? : r/woodworking
Super Black India Ink (Speedball) – Alabama Art Supply
Speedball Super Black Waterproof India Ink
American Speedball Indian Ink super black English Calligraphy