Digital BW, The Print

No, it's not really possible to match Piezography inks fade-resistance with color pigments. We can get close to UC with ConeColor.

By example below, 70 MegaLux exposure of combined visible/UV (glass filtered sunlight) on targets comprised of 30 gray patches or 30 color patches:

PiezoTone CarbonSepia: avg deltaE 1.51
worst 10% avg deltaE 2.11 

Epson UltraChrome K3 ABW "Sepia" setting: avg deltaE 3.95
worst 10% avg deltaE 6.94 

ConeColor K3 inks: avg deltaE 7.95
worst 10% avg deltaE 13.61

Epson UltraChrome K3 inks: avg deltaE 5.13
worst 10% avg deltaE 12.12


All above are on Epson Velvet Fine Art paper - using Suntest XLS.
70 MegaLux equates to 8 Gallery Years or 35 Wilhelm Years.
Wilhelm can not actually measure for color shift - only density loss.
Wilhelm does not include any UV.

Aadenburg Imaging and Archives is now testing our inks at this point, and I will be abandoning my Suntest Atlas, because in my opinion Aardenburg's the only facility out there that gives useful and accurate color/density loss information to end-users rather than feeding only 35% density loss data to manufacturers who in turn lead users to believe its a holistic accounting of ink performance.

Jon

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "finnkrogvig" <reg@...> wrote:
>  Cone make a color inkset too, but I don't know if the color pigments are as fadeproof as the pigments in the K7 inksets. 
> 
> Finn