Is that an imperial gallon, or a US one?For one gallon of 1:50 use 2.56 oz of Rodinal
Is that an imperial gallon, or a US one?
What dilution were you aiming for?
There are ~3,785 ml in a US gallon.
Rodinal doesn't keep well once dilluted, so only mix that gallon if you plan to use it all right away.
I have several bottles of Rodinal and I'm running out of Kodak D76 ( one pouch left ). I can mix the Kodak just fine with a gallon of water. But, my brain can't figure out how to mix Rodinal to make 1 gallon ( or so ) developer. I go through it pretty quickly, so I'd prefer to make a gallon batch. One shot is what I'm looking for at full strength.
Thanks again!
Bingo! The 2.5(6) ounces of concentrate per US gallon is the right ratio for 1:50 (or twice that for 1:25), but only mix what you'll use within the next few hours. Mix in the morning, and develop sixteen single rolls of 120, should be fine. Mix on Monday and expect to still use some on Friday, probably not a good plan.
Also be aware that Rodinal (clones) is a rather different developer character from D-76 (even diluted) -- there's very little sulfite in the working solution, and only a single developing agent instead of a superadditive pair, so you can expect to lose some speed compared to D-76 and see a significant increase in visibility of grain (though you're likely to also see an increase in perceived sharpness as a result of the grain increase).
It's not the question that's dumb, but the archaic measuring system. It's a nuisance in photography and also in cooking. I can't understand why the US doesn't use the metric system.
Louis G
1+49 or 1+50 makes little difference in dev.times. However, as long as you always do the same thing you'll get similar results.I'll mix only what I need then. This is the original Rodinal I bought about 10 years go. I've used it recently at 1:50 ( 1+50? ) and it was fine.
I can't understand why the US doesn't use the metric system.
It's because we're special. Seriously though, no one wants the nightmare of changing the infrastructure. Although it could be a great way to resurrect the Works Progress Administration!
Right. We're bigger than they are so they can't make us no matter how much sense it makes.Scientists routinely use metric in the US, but science is a foreign language to many Americans.I've been using it long enough that I can do most common conversions in my head, or at least estimate them.
1+49 or 1+50 makes little difference in dev.times. However, as long as you always do the same thing you'll get similar results.
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Some do. However, many have switched over (likely because there's so much variation in the spoons people use). Cough syrups now usually come with a dosing cup on top of each bottle; that cup is marked in 5, 10, or 20 ml amounts and the instructions give the dose in those units as well. Aspirin switched from grains (standard tablet was 21 grains) to milligrams (now 325 mg) decades ago -- I don't recall ever buying aspirin marked in grains, and that would go back to the 1980s.OTC remedies still use teaspoon, etc.
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