Re: Pyrocatechol

• To: alt-photo-process-l@sask.usask.ca
• Subject: Re: Pyrocatechol
• From: Sandy King <sanking@hubcap.clemson.edu>
• Date: Thu, 09 Mar 2000 16:02:53 -0500
• Comments: "alt-photo-process mailing list"
• Reply-to: alt-photo-process-l@sask.usask.ca

Dave,

Although Pyrocatechol is a staining developer it produces far less
oxidation by-products than PMK and for that reason is less likely to stain.
With the Pyrocat formula that was published in the last issue of Post
Factory I have experienced no staining with agitation intervals as long as
3 minutes.

The key to whether you really over developed the film in question would be
the contrast. The emulsion could have been fogged in a number of other ways.

Sandy King


>I'm wondering what the correct agitation is when using Pyrocatechol
>developer. I bought the Formulary Windisch Pyro-Cat kit and developed 35
>mm IR film for 12 minutes at 70 degrees F. Since it is a staining
>developer, I worried about streaks and so used my normal PMK agitation
>cycle. This is lift up and down and turn the film reel 4 half rotations
>every 15 seconds. I think over developed so badly that I chemically
>fogged the emulsion with the developer. Is this possible at 70 degrees
>F? Also, how much developer am I supposed to use for 1 roll of 35 mm
>film? I used 16 ounces of developer.
>
>Thanks,
>Dave

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