Re: Inkjet digital negatives

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From: Sandy King (sanking@CLEMSON.EDU)
Date: 04/21/03-12:33:31 PM Z


Nick,

The question about the problem of scratching with inkjet negatives
was not mean to be specific to my work with the 2000P since I have
had the same problem with other printers and OHP materials. It is my
understanding that all negatives made on OHP material, be they from
ink or pigment, are more subject to scratching than negatives made on
regular film. One would certainly assume this to be the case since
the pigment or ink on OHP material lies exposed on the surface of a
thin clay-like surface and we should not expect it to be as resistant
to scratching as a silver image embedded in hardened gelatin. As for
negatives made on Pictorico from the 2000P I have no reason to
believe that they are any more or any less resistant to scratching
than dye or pigment negatives made with other printers on different
OHP material.

I can say for sure is that negatives made from the pigmented inks of
the 2000P on Pictorico dry well and are very stable on exposure to UV
light. I have exposed one of these negatives for about 20 hours to
direct light from my HID printing light and there has been no
measurable change in the UV printing density of the negative, as
measured by my densitometer in UV mode.

Finally, I am not using the 2000P to print spectral density
negatives. Rather, I am printing a grayscale negative but in color
mode on the 2000P . The result is a negative that is mostly neutral
in tone, slighly toward the cooler side, with a density range of
about 1.6 to 1.8.

Sandy

>Sandy,
>
>You will recall that I'm still looking for the right combination of
>materials for digital negs - in my case, I am trying to use quad black inks
>and not the spectral density approach from 4/6 color inks. So, please don't
>misunderstand my question, but, are you now saying that negs produced on
>your setup with the 2000 are not as stable as I once inferred from a
>previous post? It could also be that my mind is going, but that's another
>story.
>
>Many thanks,
>
>N
>
>----- Original Message -----
>From: "Sandy King" <sanking@CLEMSON.EDU>
>To: <alt-photo-process-l@skyway.usask.ca>
>Sent: Monday, April 21, 2003 9:38 AM
>Subject: Inkjet digital negatives
>
>
>> One of the shortcomings of digital negatives from inkjet printers
>> appears to be that they are much more subject to scratching than
>> negatives on film. I wonder if anyone has found a protective surface
>> that can be easily applied without damaging the negative? Has anyone
>> tried a clear coat of satin or semi-gloss polyurethane? And other
>> suggestions appreciated.
>>
>> Sandy King

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