Measuring C-41 developer components in small volumes using weight?

[justin parker]

I have been pondering what is the simplest method to measure small volumes of the Kodak Flexicolor LU LORR C-41 developer components to do one-shot processing in my rotary processor. (For those times when I don't have enough rolls made up to justify mixing up the whole 5L+ batch.)

If I want to measure out 2L of developer tank solution I come up with numbers like this:

[TABLE="width: 327"]

Starting Water
[TD="align: right"]1220.80[/TD]


Developer LU LORR Part A
[TD="align: right"]122.08[/TD]


Developer LU LORR Part B
[TD="align: right"]34.18[/TD]


Developer LU LORR Part C
[TD="align: right"]17.09[/TD]






Add Water to Make:
[TD="align: right"]1940.00[/TD]


(Should be…)
[TD="align: right"]545.85[/TD]






Add Starter:
[TD="align: right"]60.00[/TD]






Total tank solution:
[TD="align: right"]2000.00[/TD]

[/TABLE]

To measure 122.08, 34.18, 17.09 mL seems tricky to do even with a pipettte. Would it not be easier to use a digital scale, say one that was accurate to .01g precision with a 500g capacity? Those sell for cheap. To be really precise I would need to know the specific gravity of each part, which I am not sure Kodak publishes. But I could maybe assume 1.034 which is what they have as a published number for the overall developer.

I am curious if this is a good idea or not?

Cheers,
Justin

 

[wildbill]

122
34
17
I use small graduates and don't worry about anything after the .
and I'm usually making 1L batches.
that was easy!

I think mine are 35ml graduates but I also have syringes that work well for really small amounts.

 

[justin parker]

122
34
17
I use small graduates and don't worry about anything after the .
and I'm usually makein 1L batches.
that was easy!

Haha. Perhaps I am over thinking it indeed. I have a 200ml graduate, but not one with markings down to 1ml. That would be a decent way to go.

Ok I have bought 6 x 100ml graduates with 1ml markings. I will try that technique first.

 

[heterolysis]

Use a syringe for small volumes?

Rinse well with water and then with acetone or alcohol and it should dry without any appreciable corrosion.

 

[Gerald C Koch]

A medical syringe would be Ok but the ones sold to dispense children's medications may not be too accurate. There was a problem discussed on a previous thread about HC-110 dilution.

 

[Gerald C Koch]

Ok I have bought 6 x 100ml graduates with 1ml markings.

Why do you need six graduates. One would do nicely, just rinse it out with water and shake out any water before use. With 1ml divisions you can easily measure to the nearest 1/2 ml.

 

[MattKing]

A ~ 45 ml graduate would be a useful addition to your kit.

 

[bvy]

I bought this kit also. I mixed all five liters at once and amd stored the working solution in full, sealed bottles of one-shot volume. I haven't found any evidence to suggest that the components last longer/keep better than the mixed solution. Just the opposite in most cases. But I'm always interested in hearing others' knowledge and experience.