U of S | Mailing List Archive | alt-photo-process-l | Re: green-yellow

Re: green-yellow

Thanks Mark,

For iron prints and Epson 890/1290 dye, Epson 2100 and HP 9180 pigment
inksets Yellow was always stronger to me. But that's not by measuring UV
densities with a UV densitometer, it's just by inspecting the CDRP prints;
most often (if the process ER is relatively shorter than what is needed
for pure Pd printing - to be specific), the 2nd line wasn't showing even a
hint of tone (but pure white) whereas the 1st line was showing tone at the
left part. And when the 2nd line was showing tone, white was chiming in
earlier (more on the right) than the 1st line. That's the cause of my
reasoning. Maybe I'm reading the CDRP tests incorrectly???

Thanks for joining.

9 Nisan 2009, Perşembe, 8:49 pm tarihinde, ender100 yazmış:
> Loris, if you graph the UV densities of inks, Yellow is the highest of the
> pure inks, then Cyan, then Magenta.  This is true with any inkset I have
> tested.  However, when you mix two colors, the order is USUALLY  Green
> highest, Red next then Blue the lowest.  
> What is interesting is that the values will vary some based on the process
> you are printing with.  I assume this is because different processes are
> sensitive to a different portion of the UV spectrum.
> --
> Best Wishes,
> Mark Nelson
> Precision Digital Negatives
> PDNPrint Forum @ Yahoo Groups
> Mark Nelson Photography
> On Apr 9, 2009, at 1:03:31 AM, "Loris Medici" <mail@loris.medici.name>
> wrote:
> Hi Christina,
> I was looking at your visual about colors and UV opacity (here:
> http://christinaanderson.visualserver.com/Text_page.cfm?pID=2448) and got
> confused a little bit. Are those prints from the same process with same
> working paramaters and prodecures?
> How Green (which is Yellow + Cyan) can hold back more UV than Yellow
> alone, where Cyan is a poor UV blocker (slightly denser than Magenta as
> seen from your tests)? My experience with 3 different printers taught me
> Yellow is the strongest UV blocker among color inks... How come?
> Regards,
> Loris.