Another B&W Question

[fadingaway1986]

Ok... I have my Kodak HC110 Concentrate here - how do I prepare it?


At tafe we usually use D76 which is made up from a powder and then dilute it 1:1.


But What do I do with this HC110? It is a liquid. Do I mix it with water first and then when I am ready to use it - mix it with more water?



I found a fact sheet for it - but it mentions a stock solution and a working solution...

Is the difference - stock solution is diluted - and working solution is diluted more?

Ugh. Help meeeee

 

[mysteryscribe]

Im not familier with that particular developer but in general you are exactly right. Stock is the first dilution, working is further deluted.

 

[terri]

I haven't used it either, but it sounds like the same principle as D76, you are preparing a stock solution first, then when you're ready to develop, you will prepare your working solution. Your working solution is where you can control things by the amount of dilution.

 

[ThomThomsk]

Well, according to this leaflet:

http://www.silverprint.co.uk/PDF/j24.pdf

your stock solution is one part concentrate to three parts water. Then according to Ilford's instructions for HP5+ you can either use HC110 mixed at dilution A for 2.5 minutes or dilution B for 5 minutes, assuming you exposed at EI400.

So, refer back to the PDF on the Silverprint site and you can see that dilution A is 1 part stock solution plus 3 parts water, dilution B is 1 part stock to 7 parts water. They even tell you what the quantities are to mix 300ml (which is what you'll need for a single 35mm film in a standard tank).

If I were you I would go for dilution B. Really short dev times leave you with less margin for error.

 

[Karalee]

Yup it depends on what solution your using. Also theres some good tips inside the hp5 boxes, it will tell you the soak times for hc110b (1+31) you just need to compensate if youve pushed or pulled.

Personally I think its a lot easier to use hc110 as a one shot, cos your barely using any of the syrup per roll of film, Ive gone through about 20 rolls of mf (15mls per roll) and theres still plenty left.

 

[fadingaway1986]

Karalee - so do you just make it as you go?


IE - keep the bottle as a concentrate and then when you are ready to use it add your 15ml to the water?


How long do you find it keeps for that way?

 

[Karalee]

well its one shot, so you dump it down the drain after you've used it in your tank.15mls is a tiny amount, for 35mm it would be even less. That and its just more convenient for me, usually my stop bath and fixer go bad first, but this way I know Im not wasting developer.

 

[fadingaway1986]

Hi Karalee - I meant like actually keeping it in the bottle...

(like just the concentrate - does it go off?)


I intend to dump after use - but was given the impression from the bottle and websites that the concentrate only lasts a short amount of time after opened (6 months for a full bottle, 2 for half a bottle)

 

[Karalee]

No hc110 as a syrup has a very long shelf life, at least the North American version does.

Heres a couple of links you may find useful

About HC110
Developing combos

 

[fadingaway1986]

thanks for that!!! those pages were helpfull