India ink will write a better line.

Speedball india ink is too acrylic-y and becomes gritty when trying to blend out, Higgins is too watery and does not produce sharp lines

I got tired of the Higgins ink I was buying always being watery and grey, and impossible to make smooth lines with

I use it for tattoo flash and it creates the sharpest lines and is the easiest to blend out for shading