Decimal Dilutions for HC-110?

[Al Kaplan]

HC-110 is usually diluted in ratios like 1:31 , 1:15, etc. to make quarts and pints of working solution. Rodinol is usually diluted in decimal dilutions, such as 1:100 or 1:50.

Has anybody tried HC:110 at 1:50 or 1:100? How did you adjust your developing time? Is 1:100 too dilute for good results?

 

[cjm]

HC-110 is usually diluted in ratios like 1:31 , 1:15, etc. to make quarts and pints of working solution. Rodinol is usually diluted in decimal dilutions, such as 1:100 or 1:50.

Has anybody tried HC:110 at 1:50 or 1:100? How did you adjust your developing time? Is 1:100 too dilute for good results?

Wow, Al Kalpan asking for developing advice! 😛

I've used 1:63 (Dilution H) with good results and there is plenty of information on the web about development times in dilution H.

Sorry I can't be of any help with the 1:50 or 1:100. IIRC, Gene Wilburn (RFF member) has experience with 1:100. You may want to contact him.

 

[capitalK]

I did some TRI-X 1+49 for 8 minutes yesterday. I should have written down the link I got the times from. They scanned pretty flat but with a lot of highlight detail.

 

[Al Kaplan]

Actually I'm toying with the idea of just getting a whole mess of Diafine, but my local shop told me that would be special order. They're just carrying D-76 and HC-110 these days, and sometimes they don't have both on the shelves at the same time. I have bunches of packs of D-76 on hand though, and I picked up a bottle of HC-110 to play with. I guess that I can try to extrapolate times from the published data. I should be close enough on the first try, then fine tune as needed. Thanks for the link.

 

[capitalK]

I did some digging and found the link I was referring to: HC-110 made simple:

http://www.jasonbrunner.com/hc110.html

 

[capitalK]

Also this link has lots of good useless info:

http://www.covingtoninnovations.com/hc110/

 

[Al Kaplan]

OK! Fantastic! Thanks , capitalK. This should get me started.

 

[sevo]

Has anybody tried HC:110 at 1:50 or 1:100? How did you adjust your developing time?

Haven't ever tried it on HC, but with other developers. You can approximate times for intermediate dilutions or sensitivities/contrast by drawing the known values on coordinate paper and connecting them with lines or, where you have enough values to predict one, with a curve (the function usually is reasonably close to parabolic for medium values and will only get chaotic at the extremes where other factors like pre-soak, depletion and self-moderation become relevant). Lines are good enough to start with, and will rarely be more than 20% off.

There probably are better computational methods, but I am too lazy to work them out.

Sevo

 

[delft]

One of the nice things about HC110 is, that the development times changes more or less proportional to the dilution. Double your dilution, double your time. So 1:50 would give about 80% of the time for 1:64, or 1.6 times that for 1:32 and 1:100 would give 1.6 times the one for 1:64. There is a suggested minimum amount of sirup per film (6 ml I think).

Greetings,
Dirk

 

[srtiwari]

Al,
This one is entertaining though it does not directly address the Decimal issue...

http://www.mironchuk.com/hc-110.html

Subhash

 

[Al Kaplan]

Thanks, everyone! Subhash, I haven't given up on driving up to Vero Beach. It WILL happen! I want to make the trip before I have to mow the lawn. It RAINED today here in North Miami for the first time in months.

 

[Bob Michaels]

Al: I find the key is to use either metric or oz. of final solution to simplify the math. Then I just move up to some volume that makes the math easy and end up pouring out $.02 worth of developer final solution when the tank is full.

BTW, we finally hit 20 degree C tap water here in Central FL. has not happened in several years. No need to use ice cubes to cool things down. I bet you never get tap water that cool down there in S FL. You have probably just dialed in 75 F degrees back when the earth was cooling.

I dialed in HC110 at 1:64 years ago for me. But it would have been just as easy to do 1:50 since the dilution / time seem linear. I am sure 1:100 would work if you could live with a 13 minute developing time.

I swear I am going to get back down to S FL one of these days. I will give you a heads up if I have advance notice and we can meet at that Starbucks.

 

[John Bragg]

I have found that the easy way to get Dilution H is to shoot 8 ml of syrup into the jug with a syringe and add water to make final volume of 500 ml... Near as damn it.

 

[Jason Sprenger]

Ansel Adams used the dilution 1:119 for 18mins with Tri-X 320 Pro in 4x5. I'd suppose that 1:100 would work, though I've not tried anything that dilute in 35mm myself.