Justin Low

Pyrocat-HD has been my general-use film developer, and it gives great results in medium format. It renders tones very nicely, and is great for images taken in low-light.

Here are a number of quick notes on Pyrocat-M, a variation of -HD. The formula given by Sandy King follows:

To mix Stock Solution A,

Distilled water at 50°C 750ml
Metol 2.5g
Sodium Metabisulfite 10.0g
Catechol 50.0g
Distilled water to 1000ml

Stock Solution B is a 75% solution of Potassium Carbonate,

Distilled water 750ml
Potassium Carbonate 750.0g
Distilled water to 1000ml

That’ll make a liter of stock solution each. I made up 100ml of each instead, dividing each amount by 10. The -M variation is supposed to add a touch of sharpness over -HD.

Solution A was easy to mix. Just add the various components in the order above. A slightly yellow solution resulted. Do be cautious when handling the Metol though. I experienced a mild irritation when mixing the powder, but it went away after scrubbing down. I have no problems with it in liquid form.

The Potassium Carbonate (K 2 CO 3) is tricky to store; my stock was packed in 250g sachets. It’s highly deliquescent, which poses a problem when partial quantities are used. There’s a slight vapor in the sachet now, but I don’t think it’ll adversely affect the rest of the stock. Sodium Carbonate is far easier to handle.

When mixed into solution, K 2 CO 3 appears to be rather cloudy, but it clears up in 30 minutes or so. That’s apparently normal.

I stored them in brown glass bottles with a stopper. Apparently shelf life is 6 months or so. Using it at 1:1:100 dilutions should yield 40 rolls. It’s extremely economical to use at around 10 cents a roll.

I developed a roll of Fomapan 100 in Pyrocat-M mixed to 1:2:100 dilutions as I prefer shorter developing times. 5m30s was a pretty good starting point, and produced rich negatives with good density. Looks like they’ll print easily. For Fomapan 400, 7 minutes works well for me.

Comment

  1. Justin,
    It is really nice to see someone sharing his receipe on the film developer. I was wondering if it is that simple to mix all the materials together as it was many years back when i was still a student doing chemistry practical. I try shopping around…and cannot find the right place to get the required materials stated above. Do u mind if I ask you for advice on getting the material? Thks a lot for the help. I will be waiting for your reply. If it is not possible..is okie. =)

    — hls · 14 July 09 · #

  2. Try to pick a volume that has already been well-received by others because poorly done books in this category are fairly common! Make sure you have enough vegetables in your diet. Having written goals can help you experience more personal growth?? Place a priority on having good health.. personal trainer near Chularbebmall 6727 <a href=“http://www.b1stgirl.com/about-kyle/”>personal trainers san diego</a> EnenueCar trainer london 3291 [url=http://www.b1stgirl.com/]Personal Trainer Carlsbad[/url] trainer videos Chularbebmall 4528

    — searches · 23 June 12 · #

Textile Help

More Articles