QTR-Quadtone RIP

Should I be using Matte Black or Photo Black with Pictorico OHP?

photo 

Keith Schreiber
jkschreiber.com

> On Dec 21, 2017, at 1:55 PM, lehuhn@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
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> Should I be using Matte Black or Photo Black with Pictorico OHP?
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It may depend on your printer.

I print to Agfa Copyjet to make digital positives. With my Epson 3800 I used PK ink. When I replaced it with an SC-P800 I discovered (which was confirmed by others) that PK ink was problematic in blocking UV. I recently tested MK, which held and dried fine on the emulsion of the acetate. The MK will be my preference now.

Epson PK on the P800 is not problematic in blocking UV. I have measured UV densities of 3.2 and higher and that's not even pushing the limit. (This was with a clients negatives printed on her P800 using my curves.) Even that is higher than anything I ever achieved on my 3800 and 3880 with Epson inks. If anything, keeping it from blocking up the highlights is more of a challenge, but this is for Pt/Pd. Unless your Dmax requirement is extremely high, if you are having a problem using PK the problem lies elsewhere in your workflow. MK on Pictorico OHP film is prone to smearing. That may not be the case on Agfa Copyjet, but it is on Pictorico which is what the OP asked about.

Keith

Keith Schreiber
jkschreiber.com

> On Dec 22, 2017, at 12:34 AM, Tariq Dajani tariqdajani@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
> 
> It may depend on your printer. 
> 
> I print to Agfa Copyjet to make digital positives. With my Epson 3800 I used PK ink. When I replaced it with an SC-P800 I discovered (which was confirmed by others) that PK ink was problematic in blocking UV. I recently tested MK, which held and dried fine on the emulsion of the acetate. The MK will be my preference now. 
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