Digital BW, The Print

Roger wrote:
> Paul, thank you very much. Very helpful.
> 
> All,
> 
> I am thinking these carbon inks are a solution to a major problem I've 
> observed with the UltraChrome inks, to wit, even with UV protective 
> glass, a few minutes in sun causes the ink to outgas a haze which 
> condenses on the glass. The image changes in a way that resembles 
> bronzing. This has happened to me at two different shows (Crested Butte 
> and Teton Village) at relatively high altitude, but I took care to make 
> sure the sun was only at a glancing angle--didn't seem to help. One 
> additional piece of info is that both images were color.
> 
> Fortunately, the condensed haze evaporated after the framed print was in 
>   the dark for a couple of days. These images had been printed for two 
> months before they were framed.
> 
> 1. Will the glycerin suspension in the Eboni-6 ink cause the same problem?
> 2. Are there 3rd party ink cartridges or CIS systems for the Epson 7600 
> that will accomodate the Eboni-6 ink?
> 3. Is it a plausible idea to buy a used 7600 to dedicate to the Eboni-6 ink?
> 
> I've got a 4800 using the standard Epson ink and profiles that I'm quite 
> pleased with, as long as the images are protected inside and away from 
> the sun. I like to do some color printing, but the majority of my work 
> is B&W.
> 
> Roger
> Palmer Lake, CO
> www.mindseyephoto.com

I have mentioned the possible advantage in "glass haze" 
reduction of BO printing with the 1800. The black ink used 
in total is frugal, the droplets very fine, 1.5 PL, so some 
evaporation may happen in mid air and the total will dry 
much faster. But the multi head BO printing mentioned so far 
has been with Eboni and that's a black for matte inks and 
matte papers are not problematic in frames with glass. At 
least in my experience and what has been reported on 
problems was with gloss papers. So a multi head PK BO may 
proof to be better at preventing "glass haze" but is 
off-topic in this thread.

The Eboni-6 is for matte as well I guess. But in this case 
translating it to PK black will not give the same advantage. 
With diluted PK in larger droplet machines and the use of 
glycerin for dilution I doubt that there is any advantage. 
I have always thought that glycerine's is the actual  haze 
medium and not the glycols. The last are probably involved 
in transporting the glycerines from the warm print  to the 
cool glass. The term BO for that inkset would be confusing 
too, there's less difference with normal quad ink sets other 
than that the pigment used is the same in all  inks and 
there is also a partitioning used in the driver while a true 
multi head BO will have parallel and equal  separation per head.

-- 
Met vriendelijke groeten,  Ernst


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