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# Thread: Ilford Pan F+ and Rodinal 1+100

1. 1:4 is a ratio. A ratio of one measure of developer to four measures of water. Resulting in a final volume the equivalent of five measures.

2. I think you are mistaken.
1:100 is a ratio of developer to water -> 1 part developer and 100 parts water or 1+100
1:1 = 1+1 = 1 part developer and 1 part water.
and so forth

IMHO 1+1 is easier to understand for everyone than 1:1

Originally Posted by Fotohuis
1:100 means 100 times dilluted.
So 1000 ml/100=10ml concentrate in a total volume of 1000 ml

That means: 10 ml concentrate + 990 ml water = 1000 ml total volume =>
1+99 BINGO

I will get a drink from you when i ever come to Ireland.

best regards,

Robert

3. Originally Posted by Andy K
1:4 is a ratio. A ratio of one measure of developer to four measures of water. Resulting in a final volume the equivalent of five measures.
Thats what I would have thought but going by Roberts example of 1:100, it would not be so.

Are the drinks on Robert then ?

Peter

4. Originally Posted by david b
well...i agitated for the first minute and then once every 5 minutes.

and as I previously said, I think I have to come down to 17-18 minutes which would be a reduction of 10-15 percent. that should be alright.

more testing later today.
Ok, now you've officially made it so simple that I have no excuse not to try Rodinal. =)

5. It sounds to me like liter and gallon

To end this discussion about Rodinal: In the German and Dutch instruction of the latest Rodinal bottles it is indicated as follows: 1+25 and 1+50.

So to our dillution "problem" => 1+100 10 ml + 1000 ml = 1010 ml end volume (fortunately this will also fit in the tank )

Sometimes life is hard to understand.

.... and this year we have holiday in Ireland of course, which such nice offer.... thanks.

6. By the way, talking about the Ilford problems: they just came out with an overview list of products: http://www.ilford.com/html/us_english/monopal0505.pdf

Remarkeble is perceptol: Enquire, that means maybe it will come back?

Robert

7. Brett Weston used to use APX 25 and Rodinal 1+100.

8. Originally Posted by titrisol
IMHO 1+1 is easier to understand for everyone than 1:1
That's for sure. Thankfully, Agfa and Ilford use the + sign in their dilutions, but for some reason Kodak hasn't caught on yet. They continue to use the : sign. The + obviously means plus or to add it to another part. The : means ratio, and for some reason the photographic society uses it to mean "add to" or + (plus). "Ratio" and "Plus" are not interchangeable terms in the everyday world. They are as different as shoes and bananas.

Originally Posted by titrisol
1:1 = 1+1 = 1 part developer and 1 part water.
and so forth
This is only true in photography, so it works for us. In the outside world though, 1:1 does not equal 1+1. 1:1 would not even be a true ratio. It would simply be 1. We would call that a stock solution.

Anyway, for us, what titrisol says is right. The colon (:) and the plus (+) are interchangeable. I guess it's 'cause we're special.

9. I've always considered ":" and "+" to be the same method of mixing chemicals.

Ratio of "one part Rodinal to 100 parts water" still equals 101 total parts.

Adding "one part Rodinal plus 100 parts water" still equals 101 total parts.

But at 100 or 101 parts of one solution, it's really a moot point. Being close to right is just as good as perfect at that dilution.

10. Lee is right, with such a great dilution, it is a moot point. the important thing is to do it the same way each time, 1 + 99 or 1 to 100 or what ever. It's a fine combination with Pan-F in any case, as was rodinal and the late great agfa-pan 25.
I've got 10 rolls of apx25 120 left in the fridge, what to do, what to do? that's a matter for another time.

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