Reuse Rodinal 1:50?

[ralf_j.]

I have developed one roll of film with this mix. Can I reuse this mix and extend time by 45 seconds or so? Thoughts?

 

Thanks

[SCL]

It's basically a one shot developer, and so cheap it doesn't make sense to reuse it.

[ralf_j.]

It's basically a one shot developer, and so cheap it doesn't make sense to reuse it.

That's what I read - thanks for confirming it.

[glen_h]

Ones I see say it should be 10ml of concentrate per roll.

(That is, about a roll of 135-36 or 120.)

 

Tanks I know are about 250ml for 35mm or 500ml for 120,

so for 135-36 in 250ml of 1:50 you should already add to the time.

 

If you have an unusual tank that holds 1000ml for one roll,

you should be able to do two rolls. Better to get a smaller tank.

[steve_gallimore1]

Additionally, the working life of Rodinal, particularly at very high dilutions, is so short (tens of minutes) that it'll be exhausted by the time you finish the first roll.

 

So one shot only.

 

Concentrate keeps pretty much forever though.

[tommyfilmist]

it all depends on the tank..

 

if i read the manufacturer website correctly, all tanks require 5ml per roll, OR 5ml per tank.

 

either way.... its a one shot. although does reusing rodinal make it more of a stand development scenario?

[SCL]

it all depends on the tank..

 

if i read the manufacturer website correctly, all tanks require 5ml per roll, OR 5ml per tank.

 

either way.... its a one shot. although does reusing rodinal make it more of a stand development scenario?

 

The guidance for stand development using Rodinal is that you need 4-5 ml of active solution per roll which is used up.

so, reuse doesn't work in the stand development scenario.

[tommyfilmist]

The guidance for stand development using Rodinal is that you need 4-5 ml of active solution per roll which is used up.

so, reuse doesn't work in the stand development scenario.

 

that data was from one of the retailers talking about the product or the maker, its been a while, i dont use rodinal myself.

 

but that was for regular developing in a tank

[glen_h]

The official capacity for D-76 is 4 rolls/L.

 

The rated capacity is for those who expect to get reliably repeatable results.

 

For D-76 1:1, the capacity would be half that, so should be 500ml/roll,

but there are times for 135-36 with only 250ml. One should not, however,

develop two half rolls sequentially. Also, one should not develop two

rolls of 120 in 500ml sequentially.

 

As above, one I found says 10ml of concentrate per roll. This seems to

be the conservative amount for most reliable results. I suspect at this

rate, one should be able to reuse it, with the usual increase in

time per roll.

 

Another one says 5ml per roll. Depending on your tolerance for less

than perfect results, you might decide to reuse it, up to 5ml/roll.

 

https://unblinkingeye.com/Articles/Developers/Times-Rodinal/Rodinal.pdf

 

mentions a minimum of 250ml/roll at 1:100, which would be 2.5ml/roll.

This seems like the overcapacity amount, like D-76 1:1.

 

Note that the data sheet also gives times for drums, which commonly

(at least I remember it for the Unicolor FilmDrum) use enough solution

to half cover the film. The roller action, then, makes sure that all the

film gets developed. This allows developing a 135-36 roll in 125ml,

or a roll of 120 in 250ml. One should be sure to have enough concentrate

when using these.

 

The data sheet recommends "hand tanks", which I think means not drums,

for 1:100.

 

Note that there are cases where you should have more solution than

fits in the normal sized tank. One can use a larger tank, usually with

empty reels to fill it, to allow for enough solution.