Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla <e.dinkla@...> wrote:
>
> On 04/30/2012 12:10 PM, Steve Kale wrote:
> > Ernst, remind me, what was the starting point for each? (I find it
> > rather frustrating that with OS-X 10.7 and moving to i1Profiler I can no
> > longer take a simple patch measurement.)
> 
> 
> Steve this is the paper white shift in Aardenburg I* color unit, not a 
> Lab number. It started at 100 dropped below 50 after 40 MH and is -1.6 
> at 140 MH.
> 
> The Lab numbers: at the test start Lab 96 1.3 -5.0 and at 140 MH Lab 
> 96.2 -0.3 5.0 more than 10 DeltaE shift at the b, as warm as Bamboo is 
> when new.
> No fiber/baryta paper I measured is that warm when new.

Perhaps more importantly, the initial UVincluded-UVexcluded delta b* measurement was 6.5 for this sample (see the "UV delta b* Influence" category in the AaI&A database for these media whitepoint measurements).  That value puts this sample in the high OBA category, but it also means that only delta b*= 6.5 out of the delta b*=10 at 140Mluxhr can be explained by OBA burnout. The fact that the delta E shift for the media white point has surpassed 6.5 (and as Ernst noted is now greater than delta E=10) means either that the OBA degradation products are not totally colorless, or there are other chemistries starting to discolor, or both.  Exhibition Fiber paper has the dubious distinction to be the first paper in the AaI&A database that displays this phenomenon.

Paper choice is a very subjective thing for most printmakers. There are numerous desired initial appearance properties to consider, and comprehensive information on print permanence is often hard to come by.  That said, these surprising lightfastness test results for EEF should give digital FineArt printmakers some pause to reflect.

best regards,
Mark
http://www.aardenburg-imaging.com