Digital BW, The Print

Editor, Persistence of Vision wrote:
> Ernst,
> 
> As I understand it, they are extremely small resin particles encapsulating dyestuff. That's why you are seeing the metameric issues.  Some of us expected exactly this issue. While the use of encapsulated dyestuff, instead of encapsulated pigment, ensures a wider gamiut he refractive issues created by the multiple passthroughs (with the current size/structure of particles) are substantial.. It's a greaat idea that isn't exactly, at the current stage of development,  coming to the hoped for end results.

What Steve described isn't a metameric issue. The shift is 
measured within one print, with one light source and one eye. 
I have not seen him describing metamerism and so far the 
reports do not describe Nanochromes as metameric. I see 
however many different reports on the results of the inks. 
Wonder whether they are of the same batch.

That "extremely small resin particles encapsulating dyestuff" 
could result in refractive issues and by that cause what Steve 
measures is not unlikely. But I actually think that it is 
either a hybrid ink or a dye colored resin particle (the Bayer 
infusion process I have mentioned before) so not the resin 
around the dyestuff but the dye impregnated into resin 
particles and by that more color at the surface than within 
(if there are layers possible within nano sizes like that). 
Refractive issues may still be there though, the stuff is 
transparent anyway and perfectly uniform particles in the 
smallest sizes have little opaqueness. For opacity you better 
start with non-uniform larger size particles and metal oxides. 
But that doesn't deliver a high Dmax nor do they pass nozzles 
easily.

I can imagine the dye infusion of small resin particles far 
better than encapsulating dyestuff with a resin. For  Dutch 
readers I would like to compare the last to: een drol 
vastspijkeren op een plank. Nail **** on a board  if that 
exists in English. Why are issued patents more disclosed than 
the applied ones these days ?

                    --
           Ernst Dinkla


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