Digital BW, The Print

Mark,

Another outstanding contribution to the field.  Thank you.

What are the differences between the Fiber Based samples.  There appear to
be 2 un-toned and 2 selenium toned samples.

Paul
www.PaulRoark.com

On Mon, Apr 22, 2013 at 7:54 PM, Mark <mark@...> wrote:

> **
>
>
> I've just added ID3s 282 - 289 to the Aardenburg Light fade test results
> database
>
> http://aardenburg-imaging.com/cgi-bin/mrk/_4534c2hvd19kb2NfbGlzdC80
>
> These are samples made on a Durst 51 "digital Enlarger" outputing to
> "traditional Silver gelatin" print media. RC paper versions and Fiber base
> versions are in this set. Untoned, selenium toned, and Sepia tones samples
> are also in the mix.
>
> A quick result summary: The RC paper has high OBA content, and despite
> being embedded in a swellable polymer (photographic gelatin) it burns out
> as quickly as any product I've tested. The Fiber base (FB) version has
> medium OBA content and therefore does better than the RC version in test.
> Nevertheless, no "best-in-class" performance when compared to good choices
> of inkjet media and quality inkjet inks.
>
> Chemical toning improves the results, mainly by leaching some of the OBA
> content during extended processing, and in the case of Sepia toner, perhaps
> adding some UV/Blue filtering due to the brown toning of the colloidal
> silver. That the Aardenburg testing methodology and the I* metric can
> reveal these subtleties is something for me to be very proud of, all
> modesty aside. That the industry continues to ignore the value of the i*
> metric is a bewilderment, because a precise evaluation metric
> differentiates winners just as much as it differentiates losers.
>
> best,
> Mark
> http//www.aardenburg-imaging.com
>
>  
>


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