[pure-silver] AW: Re: Any advice for purchase of densitometer.
- From: "Michael W. Hilgert" <michael.hilgert@xxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 24 Dec 2004 12:57:13 +0100
> So IOW the density reading from a pyro negative may not be an=20
> accurate=20
> guide to the required contrast filtration if you're using VC=20
> paper - which=20
> is fair enough. As the instrument measures a wide colour=20
> spectrum it will=20
> presumably read both the silver and stain densities and give you an=20
> effective total.
I am doing some testing with Pyrocat HD (TMX and TMY), including
measuring densities with a Macbeth TD 504. The problem of properly
stained negs: the higher the silver density, the higher the stain
effect. I tried using the "blue"-channel of my densitometer as an
approximation to the UV-densities and compared the results with the
silver densities measured via the visual channel. There is no constant
factor like: "add 0,4 and its done".=20
The Pyrocat stain has its highest effectiveness in the UV-Range which is
AFAIK important for alternative processing. But for variable contrast
printing I would guess the UV-part does not play such an important role.
If I standardize my development for the G-bar-values obtained via the
blue channel densities, I have to use grade 3,5 for printing. So in the
future I will work with visual densities, this seems to correspond
better with my printing technique.
Michael
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