What is "archival ink"?
Archival inks are generally made with old formulas using mineral based
pigments (like the carbon black you mentioned), rather than synthetic
dyes. You can now get archival color ink cartridges for inkjets, but the
price is pretty steep (ask your favorite artist about how much a good tube
of a red costs - no wonder they are starving!).
William Donzelli
aw288(a)osfn.org