Well here goes:
As I am interested in creating inks which are brightly coloured indeed intense I have tended to go for the inks used in medieval manuscript painting as these appear to have been the brightest most intense colour.
Daniel Thompson feels that colour could be applied to parchment ( made form skin), to wooden panels or to walls. By and large the colour that could be used to apply to parchment was described as ink as it could flow through a nib or be painted with a fine brush. However the issue of light fastness does come into play. Dyes used as inks in manuscripts did not have to be so lightfast as dyes used on panels or on fresco's.
Ink comes from "incaustum" meaning burnt in.
Lampblack and gum does not bite into surfaces as does gall ink but sits on the surface and if the gum becomes brittle or has not been prepared properly then the writing disappears.
In the medieval age carbons were made from charcoal from young shoots of grape vine, but others such as peach stones were highly favoured.