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Getting confused on dilution rate for hp-110
Old 02-23-2009   #1
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Getting confused on dilution rate for hp-110

I am going to be developing Ilford FP 4 Plus 125 with HC-110. On the Kodak bottle it says for dilution B 1 part hc 110 to 7 parts water. On the Ilford Film Processing chart is says 1 part hc-110 water to 31 parts water. On covingtion innovations is says 18.8 ml to 600 ml water. I don't think what kodak recommends is right so I went with the 18.8 / 600 ml of water dilution is this correct. I think I messed up and made a dilution of 3 oz of hc-110 to 21 oz of water. I saved this in a container and would like to know if I can convert this back to a 1:15 or 1:31 dilution? If so what is the formula?

Last edited by scottyb70 : 02-23-2009 at 12:03.
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Old 02-23-2009   #2
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There are two concentrations for the stuff you buy in the store. There is the American Syrup, which you dilute 1+31 for dilution B. Then there is the European concentrate, which is more dilute. Before you attempt to make the working solution, be sure of what you are starting with.

ps, 18.8 -> 600 is 1+31.
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Old 02-23-2009   #3
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I have never bothered with the various dilutions of HC 110 - it can turn you off film developing quickly. I just measure out what ever ml. I need in raw syrup and mix with water.
For films like the Tmax 2-400/Tri X/HP 5/Neopan 400 - it is usually 1:60 and with a time around 10.5 to 11.5 minutes.
With something like Plus X or Acros 100/Delta 100 I would try 1:60 around 7 minutes.
It is not a fine grain developer. particularly for 35mm, but if you can live with rather aggressive grain it is fine. It will also last forever in its original form (non diluted). The bottle I am currently using is from the early 90's!!!!
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Old 02-23-2009   #4
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3oz of HC-110 with 21oz of water = *roughly* 90ml of HC-110 with 620ml of water.


To convert to 1:31, add 2170ml of water. You already used 90ml of HC-110, so to make 90ml of it equal 1:31, you have to use 2790ml of water. You already added 620ml of water, so now 2790ml - 620ml = 2170ml of water left to add. = 1:31

You may not have a container big enough, so you could divide your current dilution into, say, fourths and divide the 2170ml into fourths and add it. For example, you have a total of about 710ml right now. Make it about 178ml each and add 543ml to each, or how ever you want to divide it up.

Clear as mud?? :-)

*Edit* BTW, the conversion is about 30ml = 1oz.
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Last edited by blackwave : 02-23-2009 at 16:22.
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Old 02-23-2009   #5
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To further confuse things: maybe do like they do with Rodinal, pour out the amount of water say 500ml and then ADD 5ml of Rodinal to get approximately the dilution you want. Example, 500ml of water add 5ml of HC-110 (American) syrup you have approximately 1:100 of diluted HC-110 (or in Rodinal speak 100+1). The problem (but not a problem because you have to do it anyway) is finding the best development time, temperature, and agitation.
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Old 02-23-2009   #6
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Dilution A (1:7) is far too active for hand processing. Dilution B times are barely long enough for consistency. I reccomend Dilution "H" (1:64), though for ease of mixing GeneW uses 1:100 with superb results.

While the grain isn't as fine as other soups, the acutance is good and tonal separation is superb.
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Old 02-25-2009   #7
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There is a stock solution you make from syrup if you want. The mixtures given on the bottle are of stock solution to water. If you read just above that, you'll see directions to mix the stock solution.
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Old 02-26-2009   #8
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I use HC110 all the time, and I have never made the stock solution (why - it's a waste of time and containers.) I use a small graduated cylinder or a syringe to measure the exact amount for a single shot and mix it just prior to use. The syrup lasts for years but I rarely get to leave it that long.

When I did my 5 year digital experiment, I had a partial bottle that I used upon resuming with film. It worked just fine.
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