Yes, thanks for this advice. I'm mindful of this. I've found it averages out fairly well across a roll of normal photos, however no doubt it can go wrong if the overall exposure is skewed high or low.
Whenever you are dealing with developer exhaustion, you need to remember that the amount of exhaustion will vary considerably with the subject(s) of the photograph(s). A roll of high key subjects will exhaust the developer much more quickly than a roll filled with shadows.
Oh no, stand developing always opens up Pandora's box on here. I've used it before but much prefer 1+1 D-76 or 1+4 DD-X these days. Anyways FWIW when I did do stand developing I would always use at least 5mL of Rodinal, which at 1+100 would give me a perfect 5mL/500mL Rodinal/Water split. Personally I wouldn't recommend using less than 5mL of Rodinal as it will exhaust faster, and possibly before, the magic one hour mark of stand developing.
Why one hour? Why not 48:36 or 1:03:45? What's the scientific basis behind One hour?
. 3ml will not work as expected
I am sure Tom is big enough to stand up for himself but what I think you mean is that 3ml will not work as expected for you, assuming you have tried it at this dilution. It clearly works for Tom at least the dilutions he has already mentioned. Whether you would consider the negatives to have "worked" is of course another matter.
pentaxuser
I think the rate of development is likely controlled by diffusion of developing agent from the solution to the emulsion, depending on concentration and agitation, but below a certain pH development will stop. If you were to try 1:1000 ,it depends on maintenance of adequate pH , even if it is left for a very long time.
For me film is to expensive to use in a 3ml dilution and the pictures that I take deserve better.
See p 120 here, it looks like p-aminophenol is not going to develop below a pH around 8:Yes I was thinking diffusion would provide a limit at some point.
Could you elaborate on pH requirements? Do you understand the chemistry of it?
See p 120 here, it looks like p-aminophenol is not going to develop below a pH around 8:
https://babel.hathitrust.org/cgi/pt?id=mdp.39015016032883;view=1up;seq=132
The chemistry is probably like that of methyl 1,4 aminophenol {metol} which requires sulfite to remove its insoluble oxidation product.
I generally use stand development. I use ~3ml rodinal per roll and mix with enough water to cover whatever film I'm developing.
I was debating online about specifying in terms of dilution (e.g. 1:100) vs rodinal quantity (e.g. 3ml). I strongly believe it's rodinal per roll that counts. Someone challenged me and said concentration matters, and that 3ml rodinal in 1litre water wouldn't work, because 1:333 is "too diluted". So I did this test and it worked fine (I left for maybe 6 hours to give the rodinal a chance to find the film). Nice contrast range from clear to solid black.
It got me wondering though - how far could you dilute 3ml rodinal and still have it work? If you diluted 3ml in say 10 litres of water and left it a week would it get there?
Any insight into how it actually works would be appreciated.
I suggest you read Iridescent Light by Michael Axel. It's published by Blurb.com
I am not so much misunderstanding what he said based on what you give as his quotation as simply NOT understanding what he said. He seems to be saying that to cover film you need 300ml of fluid and I agree(OK Jobo tanks only require 240ml but let's stick with 300ml ) a 120 requires double this in terms of fluid to cover it and I agree. However he seems to be also saying that you require a minimum of 10ml of Rodinal but is this per film? It is what Agfa Rodinal used to state but we know that Adox who make the same stuff claim that 5ml is OK M and that is also what Ed Buffalo in his article about Rodinal says as wellMichael Axel’s book seems to be claiming (Chapter 14) that he is using 300ml of fluid per 35ml roll. Fluid which he mixes in a 1L batch at various dilutions: 1+100, 1+200 or 1+300. This means that at 1+200 he is using 5ml of Rodinal to create 1L of fluid, out of which he then uses 300ml for one roll. This means approximately 1.5ml of Rodinal concentrate per roll. There are so many mixed messages here. Hard to know the truth without failing on one’s own?
Here is a quote from the book:
“Determine how much developer you will need. This seems very basic, but with stand development, there is no latitude for failure. I recently miscalculated the amount of chemistry needed for a very large tank that I don't use very often, and the top roll was developed along only the bottom half of the film. From now on, I will remember it this way: each 35mm roll takes 8 ounces of fluid. Each 120 roll requires 16 ounces. Your tanks may vary in size, but these are fairly standard amounts for stainless steel tanks and reels. It is better to mix too much chemistry than too little.Am I misunderstanding this?
To make one liter of 1:100 dilution of Rodinal developer, draw 10 ml of concentrated developer from the bottle of Rodinal, and put it in a clean, empty 1 liter graduate. If you have hard water, or water containing lots of chemicals and minerals, I suggest you use distilled water instead of tap water. Make sure your water is at 68 degrees Fahrenheit and mix it into the graduate containing the 10 ml of concentrated Rodinal. Mix thoroughly.
If you plan to stand develop for two hours, you should mix your developer […]”
Excerpt From
Iridescent Light
By Michael Axel
This material may be protected by copyright.
So Michael Axel's article or his page of a book which you quote raises more questions than it answers
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