Tetenal C41 kit - developing times for the 2.5 litre kit.

[CharlesDAMorgan]

The Tetenal kit comes with a booklet setting out developing times. As the number of films developed rises, the times get longer.

The booklet sets out the times for 500ml of fluid and for a litre. The latter allows double the number of films for the same developing time before increasing time as the 500ml.

Would I be wrong in assuming that for 2 litres you can double the number of films vs the 1 litre (the booklet is silent on 2 litres of solution).

Also developing times tend not to increase too much but the blixing times go from 4 minutes to a mind numbing 15. Is there an alternative or refresher that could be used?

 

[WoodallP]

Hi,

I use this kit and whilst I have never mixed 2L I expect that it would increase the number of films at you can handle for each timing step as long as it was well agaitated; however once mixed the chemicals last less long so you may be robbing Peter to pay Paul.

As I rarely develop two 120 films together I was initially tending towards the 500ml mix but realised that usage loss would soon mean that the overall quantity would be insufficient for a full 500ml tank. The downside of 1L is that you only get two mixes and than a half mix (an incentive to buy another pack maybe). Instead of this I did four 625ml mixes meaning that any liquid loss still leaves me well above the 500ml tank capacity.

When processing I treat the 625ml as 1L in terms of the number of films used but increase the blix by half steps rather than the big jumps suggested. I also do not hesitate to increase the total number of films a little.

I will admit that almost all of my developing is for test films on cameras I have serviced so negative longevity is not a major concern; nevertheless I am happy so far. I should also mention that I scan and do not wet print.

Once mixed the chemicals will last a long time if a preserving gas is used but also remember to use it in the source bottles.

I'm also interested in how to replace the blix and keep times down; can anyone help? I have seen some discussion but it tends to be for bigger quantities.

Thanks

 

[CharlesDAMorgan]

Just a quick bump!