Members: 75,224   Posts: 1,659,674   Online: 1029

1. ## Measuring Rodinal (Word Problem Ahead)

Ok, this may be a very dumb question, but it has flummoxed me and many of the people I have asked.

I am working on a solid Rodinal addiction and for the life of me I can't figure out how to measure the stuff appropriately.I am going to start using it at the 1-50 ratio and go from there.

I have a two 35mm reel S/S tank that holds about 16oz of liquid. I believe that 16oz is roughly 460ml. So it seems that the ratio for my tank should be 9ml of Rodinal to 450ml of H2O. But there doesn't seem to be a Graduate that measures from 1ml all the way up to 500ml. So do I measure my Rodinal in a small graduate and then add it to H2O already measured in a larger graduate?

I didn't think about it until I really tried to figure the actual measurements, but is rodinal really potent enough to be effective at 9ml to 450ml. I know it's true, but it seems nuts.

Am I wrong here? Is there an easier way to measure this stuff?

2. Hello Stephen,

For Rodinal and other devs I use a syringe that came with a DIY inkjet refill kit.
Your local pharmacy will have a selection.

3. ## Measuring Rodinal

I will send you a syringe if you PM me with your address. These hold 2oz. and are new shape-I'll send you 2 just in case. Oh yeah-no charge!
Regards Peter

4. I'm the same as clogz - use a 5ml syringe and rubber stopper from the local parmacist (it was free).

5. I use either a syringe (10 ml. or 20 ml.) or a graduate. I measure the Rodinal and pour it into the beaker, then I take some water into the syringe or graduate to get all the Rodinal out and put that into the beaker too. Then I pour water into the beaker to make the desired amount of developer.

I use Rodinal 1+25, 1+50 and 1+100. The small amount the Holy Water (Rodinal) is quite enough as it is very concentrated.

One thing is for sure, making a "stock solution" of Rodinal (e.g. 1+5 or 1+7) for further dilution when making working solution is a very bad idea, although it would make measuring easier. Rodinal will keep for years if concentrated but will exhaust in a few days when diluted.

Greetings Morten

6. 9mls of rodinal will do more than two film! I think there's a manufacturer recommended minium amount but anyone who uses it 1:100 probably undercuts that, I certainly do. Most measerly amount I've experimented with was 0.75ml in 300ml of water (1:400) and after 90mins of minimal agitation, my negs appeared. I don't recommend that ratio for everyday use though.

To use small doses, get a suitable sized sryinge (no needle) from the pharmacy. Measure it out, squirt into your 500ml (or whatever) graduate and then add the water.

7. Originally Posted by Nige
To use small doses, get a suitable sized sryinge (no needle)
Why not....a shot of Hot Rod into veins is quite refreshing (and helps your body develop properly )

Morten

8. Thank you all for your help!!!

9. Try measuring 18.5 ml of Ilford HC (1+31) (sorry Morten, still resisting the militia) in a 50 ml graduate for 120 film or 20.3ml for 2 spools of 35mm!
:rolleyes:
Yes a syringe is definitly the way to go!

10. just a sde note.... there are larger syringes @walgreens or @vet supply stores

I have an assortment of 2, 5, 10 ml, and I find the 5ml the most useful.

Page 1 of 4 1234 Last

 APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY: