HC-110+simple arithmetic

[mike goldberg]

OK... my negs are drying, and they look good. I've pretty much settled on HC-110 Dilution H, 1:19 with Tmax [old] and HP5+.

This is what I'm doing:

My tank is 2 reel capacity, stainless. It holds 460ml filled to the brim. The upper of two reels, sits well below the brim.

NOTE: I usually develop one film, as I'm still fine-tuning my method. Thus, whether it's one film or two, the TOTAL amount of liquid in the tank is 420ml... because:

- If it's one film, it is more than covered with the mixture.

- If it's two films, the volume of the two reels raise the level of the liquid somewhat, and both reels are covered.

- Using the above quantities, I've got consistency whether one or two films are developed.

HERE is where I turn to my more experienced colleagues for help 🙄
Dilution H is 1:19... thus, my UNIT is 20. Since I'm working with 400ml water in the tank, I mix in 20ml HC-110 [European] syrup using a syringe; 400+20 = 420. These are numbers that are easy to work with. Does this seem right?

As for Time, Temp & Agitation, this has worked out well with HP5+ at:

ISO 200, 8.5-9 minutes development

ISO 400, 9.5-10 minutes development... both at 68f.

Agitation is:

Initial... 20 seconds

Three inversions of the tank... or 8 seconds Agitation per minute.
Feedback is very welcome,
Mike

 

[rogue_designer]

math sounds right to me.

I love this stuff.

 

[lZr]

Mike, but how much HC-110 you will pour for 460 ml water?

 

[Trius]

Hey Mike: It's working, right? I mean, the negs look good? The your math is right! 😀

 

[charjohncarter]

Mike, the only thing I see that may or may not be wrong is the total syrup needed for two rolls of film (35mm). In the USA 6ml of syrup is required to develop one roll of 36 exposure 35mm film or one roll of 120. I use 7.8 ml of USA syrup per 500 ml of water (1:63) for dilution h. This is just enough to do two rolls of 24 exposure 35 film. What you might want to do is do the math to be sure you have enough syrup to do two 24 exposure rolls. I got this information from a site that is called Covington..... and I couldn't find it just now, but with some work I'm sure you could.

Carter

 

[f/stopblues]

Just google "HC110" and the Covington site will come up first or second. It has a lot of good info. There's another Covington site for Xtol which is equally helpful.

 

[mflannery]

Mike-I think your ratios work fine as an approximation of your 1:19 target, but technically I think the actual amounts to achieve the 1:19 ratio are as follows
My math skills may be ancient, so I am happy to be corrected by somebody who understands this stuff better:
For 420 ml total, 399 water, and 21 HC-110, and
for 400 ml total, 380 water, and 20 ml HC-110
In the end, if your negs are great, your ratios are fine.
Mike

 

[J J Kapsberger]

...Dilution H is 1:19... thus, my UNIT is 20. Since I'm working with 400ml water in the tank, I mix in 20ml HC-110 [European] syrup using a syringe; 400+20 = 420. These are numbers that are easy to work with. Does this seem right?...

MFlannery is correct. 1:19 means 1 + 19. There are 20 parts in total. The mixture is therefore 1/20 HC110 and 19/20 water. If you want to use 400ml of working solution, you need 20ml HC110 and 380ml water, as mflanner has noted.

That's confirmed by the chart on this page: http://mysite.verizon.net/fowler/photo/hc110.htm

 

[Trius]

Oh my, I have been so wrong!!!! I mix my Rodinal 1:100 using 1 part stock in 100 parts total volume, i.e. 1+99. But, as shocking as it may seem, after testing my times, my negatives are properly developed, even though I should have used 1 + 100, not 1 in 100. How can this be??? :bang:

OK, backing off from sarcasm ... it doesn't really make a difference if you test and find the result that works for you, and are thereafter consistent. That was my point upstream about Mike's math being right if the results are "right". Some people use HC-110 in a 1:100 dilution. Since that isn't listed anywhere as a dilution in Kodak literature, I guess it's also "wrong", whether you dilute 1+100 or 1+99. 😛 😀 😛 😀

 

[mike goldberg]

Thanks all,

Trius, we both have learned something here. I wondered about 380ml of water, as possibly being the appropriate quantity [in my tank]... into which the 20ml of HC-110 syrup goes? Since my negatives were "thin" last time, tonight, when I mixed Dilution H, I used 22ml syrup. Lucky me; it balanced out ;-)

BTW, here's the Covington Link:

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

Further, the Link Darren posted above is great, with detailed charts.

Re: my math... It's really an equation. Sure, I figured one side OK, that of the 20ml of syrup. And, clearly 1:19 means 19/20 on the water side as well... thus, 380 ml rather than 400ml. Since this is working well, I want to stay with it.

Ciao, Mike