[pure-silver] Re: D-Max with pyro


----- Original Message ----- From: "Jeffrey Thorns" <puresilver@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, December 11, 2005 11:18 AM
Subject: [pure-silver] D-Max with pyro


For those of you that use a pyro developer,

Is it normal for the D-Max on a pyro-developed piece of film to be noticably less than that with 'normal' developer on the same type of film? (I don't have a densitometer, so I can't give you a reading, but it is very noticeable, side by side.)

When I look at the leader of film done in, say, Diafine, then at the leader done in WD2D+, the density is noticeably less with the pyro film. I've noticed that I have to print pyro negs with higher contrast than non-pyro, but I understand that is somewhat understandable, because pyro is a little softer-acting that a normal developer. (?)

Remember that Pyro staining developers are sort of a combination of a developer and an intensifier. The stain does not pass blue light so it adds to the _effective_ density of the negative where non-color-sensitized materials, like graded printing paper, are used. For materials with green or red sensitivity the effective is less. A densitometer must read using the same spectral characteristic as the material. Using the blue filter will give a more accurate reading than white light but the blue channel of most densitometers is set to match color printing materials and may not be such a good match for printing paper or UV sensitive materials such as Platinum or other alternative printing methods.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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