>Quote from: deanwork ... "They have a new pure carbon that is not as warm ..."
That would be interesting, if true.
The appeal of the original MIS Eboni was that it was a pure carbon ink that, particularly in older printers with larger dots, was actually neutral. It didn't last, however, due to modern printers' smaller dots causing more warmth. [The reason for this is that as the dot or particle size increases there is more edge relative to area of dot or particle, and it is the edges of the dots/particles that cause the warmth. Pi D (circumference) increases less than Pi R squared (area) as the dot size increases]. It turns out the neutrality advantage of old Eboni was probably caused by less effective dispersants that caused the ink to have more agglomerated particles which, in effect, increased the average particle sizes.
So far, every "carbon" ink I've tested that is claimed to be neutral has been spiked with color pigs.
My approach to be best archival neutral print has been to use the best color pigments to pull the naturally warm carbon to neutral. Sadly, there is no good blue, single-pigment carbon color offset available to us. (I found a Daniel Smith pigment that did it, but it was not prepared for inkjets, and I don't have the scale to do that, nor did MIS Associates when I suggested it to them.) So, we have to use a combination of cyan and magenta, or, better, cyan and blue (smaller hue angle). My current formula uses Canon Lucia pigments to do this.f (See p. 2 of
https://www.paulroark.com/BW-Info/7800-Glossy-Carbon-Variable-Tone-2016.pdf, bottom of the page for the formula.) (Beware that the new Canon "pro" pigs appear to be less lightfast than their older ones, which are still available.) Note that finding color pigments that have the same fade rate (or close) is needed to avoid a drift into a greenish hue as the magenta used in most (or all) formulas fades faster than the naturally tougher cyan.
We really need a truly neutral, carbon-tough pigment, but so far, I have not found one. HP makes a very nice, neutral ink, but it is not in the pure carbon fade rate class. I assume Epson has made the best LK and LLK it can, but they appear to me to be, in effect, carbon plus cyan. They are not neutral.
So, my hat's off to anyone who comes up with a truly neutral, pure carbon grade, inkjet compatible pigment. I suspect it'll take some heavy duty chemistry, and if accomplish, we'll see some believable, third party test results to verify the claims.
FWIW,
Paul
www.PaulRoark.com