SKU: 20840799670

Photographers' Formulary PMK Pyro-Metol Kodalk Developer for Black & White Film (Powder) - Makes 25 Liters

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Description

Photographers' Formulary PMK Pyro-Metol Kodalk Developer for Black & White Film (Powder) - Makes 25 LitersPhotographer's Formulary PMK Pyro Metol Kodalk Film Developer , PMK stands for "Pyro Metol Kodalk". Kodak has changed the name Kodalk; to Balanced Alkali; this is their proprietary name for sodium metaborate. The formula is constituted to achieve the best overall results in consideration of the following technical criteria: sharpness, maximum image stain, minimum general stain, edge effects, film speed, flexibility for Zone System Plus and Minus

Photographer's Formulary PMK Pyro-Metol Kodalk Film Developer , PMK stands for "Pyro-Metol-Kodalk". Kodak has changed the name Kodalk; to Balanced Alkali; - this is their proprietary name for sodium metaborate.

The formula is constituted to achieve the best overall results in consideration of the following technical criteria: sharpness, maximum image stain, minimum general stain, edge effects, film speed, flexibility for Zone System Plus and Minus development, stability, repeatability, convenience of use and long shelf-life.

The PMK formula was developed by Gordon Hutchings in 1979, and is designed as a universal developer for a wide variety of modern emulsions used under diverse conditions.

PMK is known for it's unique tanning and staining action. This is due to pyro, its key ingredient, PMK provides both exceptional detail and gradation that no other commercial developer can rival, and its ability to separate nearly-adjacent tones (particularly in the highlights) is legendary.

An alkaline fixer solution such as TF-4 is recommended for achieving maximum pyro stain on the negative. A conventional rapid fix may diminish staining effects of pyro and PMK formula The PMK formula consists of two stock solutions.

The "A" stock is the developer agents and the "B" stock is the alkali, or accelerator.

To Make 25 liters of Working Solution

UPC: 675152150455
Packaging Info
Package Weight 0.55 lb
Box Dimensions (LxWxH) 5.7 x 4.9 x 2.8"
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
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SKU: 20840799670

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mo dale
West Palm Beach, US
★★★★★ 5
Great thing to have.
Size: 9 inches
Great thing to have. For my small yard, it is perfect for me. Yes, the battery life does not last as long as I would like be, but I would buy this again. Great power and speed.
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Reviewed in the United States on March 14, 2026
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Amazon Customer
San Leandro, US
★★★★★ 4
Edging made easy
Size: 9 inches
Surprised how well this works. I was looking for no cord for long driveway. The battery takes a bit to fully charge, but lasts for the entire job. The levels for depth make edging around d flower beds or raised beds easy- not really a trench, but gives a good edge. Lightweight and easy to manage. Definitely lighter than my corded edger. The blade is sensitive and the guide to keep it steady along concrete is not great- just need to make sure you watch closely or it will spark when it hits the concrete.
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Reviewed in the United States on July 26, 2025
J
Verified Purchase
Jeff B.
Chelsea, US
★★★★★ 5
Works well, a little under powered
Size: 9 inches
Works well, a little under powered when I used it for the first time. Once you get the groove established it works great to maintain it
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Reviewed in the United States on May 22, 2026
G
Verified Purchase
gbd99
Pawtucket, US
★★★★★ 1
It’s junk
Size: 9 inches
Deserves a zero. Like some others said on here, it runs for 3 seconds and just stops with battery fully charged. I got it for Christmas so too late to return. More China junk.
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Reviewed in the United States on April 25, 2026
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Verified Purchase
John J.
Houston, US
★★★★★ 5
Great price, does a good job
Size: 9 inches
 I’m mostly old. School when it comes to yard equipment. A gas engine has got to be better than a battery . I have  a weed eater that will take out a tree but makes a lousy edger. Since I  don’t have a large lawn, I gave this guy a try. Turns out it does a pretty good job. Can’t beat the price and it’s simple to use. Be aware, this vendor sells the unit only. They have no spare parts and you will need to source replacement blades. ( they supply 1 spare). Otherwise, worth a try. John J Why did you pick this product vs others?: A cheap price and a limited need.
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Reviewed in the United States on July 15, 2025

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