Let me add that WJ1082 is the Image Specialists' ink that is the input for the MIS Eboni inksets. STS acquired Image Specialists, but continues to sell the IS inks, at least at wholesale or large purchase sizes.
For these drop tests, a carefully used syringe will work to deposit a single drop of ink. (I have a specialized tool that is easier to use and a bit more uniform in terms of drop size.)
The drop needs to totally dry. This is going to take a long time; it may be best to just leave it overnight. I think the pigments clog the pores of the paper. So the ink liquids slowly spread across the surface, ultimately with the paper or coating filtering out the carbon and letting liquid dyes through the edges. It has worked better than the rudimentary paper chromatography I've tried.
The test does not work with very dilute inks. I think because there are not enough pigments in the drop to clog the paper pores and the dyes just go straight down into the paper with the clear base.
The test will probably also not work where color pigments are mixed with carbon such that the paper filters them out as fast or faster than the carbon. Carbon is very small. Many color pigments are larger than the carbon, so they'd be filtered out before the carbon, leaving the edges looking like pure carbon. I have not tested the well known carbon-color pigment inks. With carbon-color pigment blends, other tests more often work better. For example, they tend to separate and not infrequently stain the bottles with the color.
Paul
On Fri, Dec 19, 2014 at 11:40 AM, roark.paul@... [DigitalBlackandWhiteThePrint] <DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:
The Jpeg below shows the result of one of many tests I (and MIS) do to be sure Eboni stays 100% carbon.
Be sure to look at it at 100%.
