I tried how coloured inks work at on-location drawing.
That's why I show it here: it did not work, at least not for me.
You can't wash out the brushes, the pots of ink are not easy to handle (when you draw standing up). You end up with lots of paper tissues, and you are constantly worried the inkpots will fall or being tripped over. Advantage: the depth of colour is much more vivid.
I like working with inks, but not on location. I doubt if I will do this again.