Thanks Greg! Tod's information is very precise as allways, and is in line with my findings. I'm also using the Kremer concentrates (see this post for direct links). For monochrome work I sometimes work with bulk archival inkjet inks. Especially one carbon black, Epson Ultrachrome replacement ink, sold by MIS as Eboni black. It actually comes from Image Specialists (WJ1082). I never tried full CMYK carbon with inkjet inks but that should work. I allways felt using inkjet inks was a bit cheating... At least colours are nicely balanced out of the bottle.
Originally Posted by gmikol
Inkjet inks are very finely divided and kept in suspension by some extra's, mainly glycol. I never saw any side effects from these extra chemicals. The Kremer pigments concentrates contain also dispersion agents and differ quit a bit how the keep in suspension in their bottle. The bismuth vanadate yellow is the most difficult to keep in suspension. The other 3 colors not. Finding the right colorbalance is also somewhat difficult! I am using these several years for tri-color gum, so I knew them allready. As a rule of thumb one needs equal parts (in weight) of the K (1 part) and C (1 part), a little less M (0.8 part), and a lot more of the bismuth Y (1.6 part).
Regarding the colorconcentrates: I allways dilute the pigment with water and bring this to temperature before mixing. The mixed glop I keep for at least one hour on a temperature controlled magnetic stirrer with the temperature sensor in the mix. The also warm DAS (3% in water premixed) goes in at this last stage. be careful to use safelight from that moment. I count for this extra water added when making the gelatin mix.
The Kremer isoindolinone yellow (PY109) can be found here and the Permanent Yellow (PY154) here.
Last edited by keesbran; 09-26-2012 at 03:42 AM. Click to view previous post history.
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