Like I said in the beginning, I think it would be better to leave ink making to industry. To answer your question about how pigment could be suspended in the vehicle, I don’t think that would be a problem because pigments don’t seem to settle in the thick vehicles we use, perhaps because they are not heavier than the vehicle itself. Also, can you imagine how dirty and messy obtaining the black pigment in above described way would be? And of course, a burning pine pitch fire could easily get out of control and burn up the tent, as well as you and your possessions. I don’t think you should try this though, because linseed oil is flammable and boiling it would only make it more flammable, so that to boil it would be very dangerous. This was great ink pigment because the particle size was very small. The tent was then tapped so that the black pigment would fall on the sheet. Then the bucket would be removed, and a sheet put down inside. The black pigment particles from the smoke would then coat the inside of the tent. Then black pigment could be made by putting a bucket of something that would burn with black smoke (pine pitch?), in a tent, lighting it on fire, and letting it burn out. In colonial times, as I understand it (and I welcome more info/corrections on this from others), ink vehicle could be made by boiling linseed oil until it got thick. Examples are dryer, which promotes the drying of the ink, and wax (not the type you think of as candle wax) which gives the dried ink film better rub resistance. The additives are substances which give the ink other desired properties. Since the pigment starts out being dry like a very fine powder, the vehicle also allows the ink to flow enough so that it can be rolled into a thin film and transfer from the press to the sheet during the printing process. The vehicle then surrounds the pigment particles and protects them and binds them to the sheet you are printing on. The pigment is mixed, or “ground”, into the vehicle. The vehicle is composed of resin dissolved in a solvent. Ink is made up of 3 parts: pigment, vehicle, and additives. Pigment making is a dirty, toxic process which I think is mostly done offshore now, in places with more lax environmental laws than North America. One of a person’s hairs is roughly 75 microns in width, so you would need some pretty small, and consistently sized, pigment particles. Ink pigment particle sizes are in the range of 0 to 1 micron.
From the background of commercial and package printing, (not from the background of an artist), I think this area might better be left to industry to supply your needs.
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