victor_petryakov

<p>Has anyone tried Kurare R-1130 polymer instead of gelatine for cyanotype on glass?<br>

Bostick & Sullivan sells it.</p>

<p>Hi Federico,<br>

I'll brake a pledge of OMETRA and tell you a secret given by American war photographers to Russian war photographers at the end of World War II.<br>

HOW TO FIND OUT PROCESSING TIME OF ANY FILM IN ANY DEVELOPER:<br>

1. In a darkroom cut off a few strips 6-8 mm wide from the film you want to develop.<br>

2. Turn the lights on. The strips are fogged now.<br>

3. Take one strip with your right hand and a stopwatch with your left hand.<br>

4. Dip one half of the strip in a developer and start a stop watch. The emulsion side of the<br>

film strip placed in a developer will start lightening first and then darkening.<br>

5. WHEN THE DARKNESS OF BOTH PARTS OF THE STRIP MATCH STOP THE STOPWATCH!<br>

6. Divide the number of SECONDS shown by the stopwatch by 3. This is your developing<br>

time in MINUTES. If stopwatch shows 24 seconds, developing time is 8 minutes.<br>

7. Repeat two-three times for consistency. This method never failed for the last 60 years.<br>

Buena fortuna,<br>

Victor Petryakov<br>

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