View Full Version : HC110- I made a mistake but everything was fine?

Brian Bullen
6-Oct-1999, 13:26
Yesterday I mixed a solution of HC 110, what i thought was dilution B. I devel oped my 4x5 T-max 100 negs for the recommended time (9.5 min. at 68 deg)and my n egatives came out much like I expected. Good contrast, nice grain. Pretty much how I expected them to come out. Today I was reading more about HC 110 and not iced that I accidentally mixed the solution wrong. I mixed 16oz. of HC with 11 2oz. of water. Now this is 1:7 ratio but certainly not dilution B. Dilution B is 1:31 from concentrate. Can somebody explain my rookie mistake and why everyt hing came out great? I'm confused, thanks B.

N Dhananjay
6-Oct-1999, 18:50
Two sources of confusion. When you say you mixed 16oz of HC110, is that 16 ozs from the liquid concentrate as it comes out of the bottle or is it from the stock solution you make by mixing the stuff from the bottle with water as suggested in the instructions? The 1:31 figure is for the slurry straight out of the bottle. The 1:7 is for the intermediate stock solution you prepare by diluting the concentrate (slurry) from the bottle with water. The two are identical and are dilution B. The only difference is that the concentrate is very concentrated i.e., active and that is why Kodak recommends the intermediate stock solution - small errors in making up your dilution B will not affect the activity as much if you use the stock solution instead of the concentrate.

If that is not the source of the confusion and you did make an error (i.e., you did make the mistake of mixing 1:7 from the concentrate instead of the stock solution), I'm guessing you still got 'good negs' because you're processing Tmax. I do not know what the recommended times are for T Max but I do remember that Kodak recommends a temperature of 75F. So, if you did mix the developer to a higher concentration (more activity), you also processed for the same time at a lower temperature (less activity) and I'm guessing those two errors cancelled each other out.


Brian Bullen
7-Oct-1999, 08:34
Mr. Dhananjay I mixed 16oz. of HC110 concentrate to 112 oz. of water making one gallon of solution. I checked my times again and the Kodak Dataguide recommends the time and temp. that I used as the "ideal". I'm still confused because the solution I used was obviously too strong. I guess I owe this one to luck. Thanks for the response. B-

mike rosenlof
7-Oct-1999, 11:30
Have you printed the negs yet? I would guess that if all other variables were under control, you really have overdeveloped the film. You may very well find that you need to use a lower grade paper or filter to get a really nice print.

Overdeveloping is not usually the best idea, but unless you go WAY over, it's rarely a total disaster.

N Dhananjay
7-Oct-1999, 12:32
I got back and checked the times last night. I'm afraid I was wrong - the 75F is the recommendation for using TmaxRS developer. HC110 is 68 F. However the recommended time is 7.5 mins (at least in my copy of the Kodak dataguide). So it sounds like you've used a higher concentration and possibly deeveloped for a longer time as well. I think I would agree with the previous post. Many of todays emulsions have very long straight line portions. This means that the neg will show nice separation of tones and can be mistakenly interpreted as looking OK and containing all the information you need but of is actually overscaled for the density range a paper can handle. I'm guessing your negs are either going to be difficult to print or you have compassionate gremlins in your darkroom... DJ

Erik Ryberg
7-Oct-1999, 18:10
If you are new to TMX, you may have also underexposed, which, coupled with the overdevelopment, would end up looking sort of normal.

Most of the people I know who shoot TMAX shoot it at 50. I gave up on the stuff entirely.

29-Sep-2014, 09:36
I made a mistake and everything is NOT fine! Not to highjack but this is along the same lines. I made a mistake mixing HC110. I have been using concentrate at 1:7 for developing Ilford HP5.:( So.... now that I have found and will be correcting my error what will be different?:rolleyes: My negatives have been dense and the whites very hard to control. LOL! Dang it!


Neal Chaves
29-Sep-2014, 12:46
1:7 from concenrate will grow hair on a billiard ball. For HP5+ rated at 400, I use HC110 1:31 from concentrate (this is the same as Dilution B) for 5:00 at 75* or 7:30 at 68*

29-Sep-2014, 13:29
OK, I am confused. I just bought a bottle of HC-110. I have the Kodak Technical Data sheet right here. It says, and I paraphrase, working solution form "stock" solution, dilution B mix ratio is 1:7. For a working solution from concentrate (I assume straight from the bottle) 1:31. I understand the 1:31 for dilution B. But what is the "stock" solution?

Jim C.
29-Sep-2014, 14:42
Jmarmck, Stock solution is 1 part concentrate mixed with 3 parts water ( 1:3 )

The Kodak Tech Data sheet then has a table to use to dilute the stock solution to a working solution.
So if you want a quart of working solution from your stock solution ( 1:3 ) then the table
says add 118 ml of stock solution to 826ml water, which is 1:7.

There is a separate table in the data sheet that you can use to mix concentrate to working solution
which I use all the time, seems easier for me and I don't have stock solution going bad if I don't
use it in time.

29-Sep-2014, 18:06
OK thanks Jim. It was in the first paragraph. I went straight to the tables and not see the instructions for mixing the stock solution. Thanks
Yes, I think that the 1:31 from concentrate is probably what I will do.

29-Sep-2014, 21:11
That is what I did. Read the paragraph just before the tables. It says that the "stock solution" is mixed 1:3. Very poorly written if I may say so myself. If you go through the math in the first table it comes out a 1 part HC110 concentrate to 31 parts of water when using "stock" solution.

Here is the quote:

"To prepare stock solution, dilute one part concentrate with
three parts water......"

Scanning for numbers in the paragraph will not pick up any information.

By the way I know it is correct to mix 1:31 because I did a couple of slides and all my high contrast problems went away. It will work, which is a miracle, but one thing I picked up on is that I was also having focusing problems in the enlarger. No wonder, part of the emulsion was pitted horribly.

Take care,

Jim C.
29-Sep-2014, 21:43
When I first tried HC-110 I read that data sheet 3 x before I got the reference to the stock solution,
guess it might have been the zeal to use it and scanning the tables for the amount to mix that makes
you miss that little tidbit of info, I agree it could have been written or laid out better so that the
info for making the stock solution isn't glossed over..

29-Sep-2014, 22:53
[1 part concentrate + 3 parts water] = one part stock

[1+3] [1+3] [1+3] [1+3] [1+3] [1+3] [1+3] = seven parts ALL WATER

Add-up the 1's and 3's inside all the brackets in the two lines above (the sum is 32) and now you can see where the "1" part concentrate and the "31" parts of water come from!

"K.I.S.S." version: Dilution B = 1 part concentrate + 31 parts water.

30-Sep-2014, 15:09
"K.I.S.S." version: Dilution B = 1 part concentrate + 31 parts water.

Indeed :cool: