Making Kodak D23 Black And White Film Developer
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- čas přidán 8. 09. 2024
- I have heard so much about Kodak D23 developer so I decided I wanted to give it a try which means that I have to mix the Kodak D23 from scratch, not something I have considered before.
The chemistry I used was.
Metol: 7.5g
Sodium Sulfite Anhydrous: 100g
Water to make up 1 Litre.
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Before desolving the Metol, take about 2 ~3 grams of the Sodium Suplhate and dissolve it in the water. This helps preventing the Metol oxidising as soon as it is mixed with water. I also strongly recommend using distilled water for making the stock solution.
3:56 "Metol can oxidize very quickly" at the same time showing the open bottle of metol.
I've used D-23 in replenished form a couple times. Back in 2006, I made up a batch of D-23 and one of DK-25R (the replenisher) and used it for most of a year, until the solution was the color of weak coffee, but I've since understood I replenished too long. John Finch (Pictorial Planet here on CZcams) recommends replenishing only until you've used up replenisher equal to *half the original volume of stock solution,* then keeping 1/4 of the replenished stock, topping up with fresh stock, mixing fresh replenisher, and starting the cycle over -- only the second and following times, there's no need to season the stock solution by developing three rolls per liter as you'd do when starting fresh.
Metol does oxidize very quickly. That's why you put a pinch of sodium sulfite in and dissolve it before you add the metol. Also metol will not easily dissolve, if at all, in a sulfite rich solution, so when it says "a pinch" it means a pinch, or about 1/5 of the amount he put in here.
Excellent Ian. Thank you for sharing!!!
Great video! Looking forward to seeing you use this.
Sir, why didn’t you first start with a pinch of sodium sulphite and then add the metol? Since there is already oxygen in the the water, as soon as you add the metol to the water, you already have a reaction of oxidation to the metol. I would have made the measurements of the chems on some paper, and then start with a slight bit, a slight bit of sod. Sulphite to neutralize the oxygen in the water. Then, add the metol until dissolved. Finally adding the sodium sulphite to the amount for a liter of the developer; with no extra sodium sulphite addded to the mix.
When you say "soft developing," are you referring to reduced highlights and contrast similar to N-1 in the zone system? I have to assume at 1:3 the developer would act as a compensating developer similar to a two bath method for extreme contrasts. It would be good if you talked about its effects and why you are using it. Informative, thank you.
From what I understand so far about this developer, at 1:3 it produces more in the way of semi-compensating such as a Pyro based developer which is going to help in scenes with high contrast for taming the highlights.
At 1:1 it is supposed to give a long tonal scale, ideal for a normal scene contrast range with good accutance.
Why not start melting Sodium and then put the Metol to privent oxidizing ?
You will probably find it will not dissolve into the sodium very easily