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# Thread: Maybe an obvious question..1-0 1-1

1. ## Maybe an obvious question..1-0 1-1

OK.. developing instructions has developing strengths labeled like this.. 1-0 and 1-1.

I'm I understanding correctly..? 1-0 meaning half strength with more time, and 1-1 full strength with less time? I should mentions, that I've never had an issue but was curious and I tend to over process instructions.

ToddB

2. 1-0 means full streangth, ratio of developer to water. 1-1 means half strength, equal parts developer and water.

3. Originally Posted by ToddB
OK.. developing instructions has developing strengths labeled like this.. 1-0 and 1-1.

I'm I understanding correctly..? 1-0 meaning half strength with more time, and 1-1 full strength with less time? I should mentions, that I've never had an issue but was curious and I tend to over process instructions.

ToddB
I think you have it reversed, but I'm not sure I recognize those sorts of instructions.

The two types I see a lot are 1+1 or 1:1.

The former is clear, and refers to stock plus the same quantity of water.

The second can cause confusion - does it mean 1 part stock in 1 part working solution (i.e. just stock) or does it mean the same as 1+1 (working solution is 1 part stock plus 1 part water).

Another way of designating undiluted stock would be 1+0.

The undiluted developer will require more (correction: less) time than the diluted developer.

4. I've been doing it 1+1, never had a issue, but recently confused on the other ratio.

Todd

5. 1-0 means full streangth, ratio of developer to water.

Ok.. I use D-76 powder and I obviously mix it water as per instructions.. So I'm correct by developing film 1+1 ratio?

Todd

6. Do you mean 1+0 and 1+1?

I'm accustomed to seeing developing strengths as ratios of stock solution - water.

So 1-1 , 1+1 or 1:1 would be one part developer, one part water (half strength).

1-0 would indicate 1 part developer, zero parts water (full strength).

A good clue would be to check the times given for the different concentrations of the same developer and film/EI

If you see 1-0 is 6 minutes and 1-1 is 9 minutes, it's a safe bet the 6 minute time is full-strength.

7. Lots of answers in a short time, everybody's right...

8. Originally Posted by ToddB
1-0 means full streangth, ratio of developer to water.

Ok.. I use D-76 powder and I obviously mix it water as per instructions.. So I'm correct by developing film 1+1 ratio?

Todd
When you make up your developer, you pour the powder into water, do some stirring, and then top of the volume with more water.

That gives you a quantity of developer "stock", which you can use over time to develop a number of rolls of film.

With D-76, many people use that stock undiluted - I would describe that as using it "stock" or 1+0.

Others prefer to use a diluted version. So immediately before developing the film, they mix some developer stock with more water.

If they choose to use their D-76 one part stock plus one part water, they describe that as using 1+1.

If they choose to use their D-76 one part stock plus two parts water, they describe that as using 1+2.

If they choose to use their D-76 one part stock plus three parts water, they describe that as using 1+3.

etc.

9. Originally Posted by ToddB
1-0 means full streangth, ratio of developer to water.

Ok.. I use D-76 powder and I obviously mix it water as per instructions.. So I'm correct by developing film 1+1 ratio?

Todd
Yes. After you have the stock solution mixed according to the package... THEN you mix as much as you need at 1 to 1 (and dump that when done processing because it's only good for one-shot ... unless you want to add 15% developing time for the second run - practically nobody uses D-76 1:1 twice except in emergencies or by mistake).

10. Yes.. I pour powder and top off with water making a gallon of stock. sounds like I was correct. Undiluted sounds interesting.. however I'll stick with I'm used to, thanks for the clarfication.

ToddB

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