Filmwasters
Which Board? => Main Forum => : AJShepherd May 08, 2016, 12:58:13 PM
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I've used the 1 litre Tetenal C41 kits for developing colour film and had mostly good results, however I notice that they've withdrawn the 1 litre packs and just do 2.5 litres.
Does anyone know how long the opened but unmixed concentrate would keep for? I should hate to mix a second batch and find it's useless. What's a good alternative?
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If you don't mind blix instead of bleach & fix, the Unicolor kit is good. I have used it many times and it seems to last well past the manufacturer's recommended roll count. It works pretty well with Reinhold's room temp method as well.
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I've had nice results with the Rollei Digibase C-41 kit, and they sell it in 1 litre format - this is a link to the mix instructions (http://www.maco-photo.de/files/images/C41_InstructionManual.pdf).
You can find it in Firstcall for 25.52 GBP (http://www.firstcall-photographic.co.uk/rollei-digibase-c-41-lt20-midi-kit-1l/p3337) or in Macodirect for 29.81 EUR (https://www.macodirect.de/en/chemistry/color-chemistry/c-41/4352/compard-digibaise-c-41-midi-kit-for-1l?c=649).
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I used to split the 1L Tetenal kit into 2x500mL, leaving the other half of each concentrate in the opened containers. It always lasted until I had exhausted the first 500mL and seemed to work perfectly when I diluted it down to working stock. That being said, I did occasionally have batches that mysteriously died, and because I wasn't very scientific about determining the cause I can't 100% rule out the storage of the concentrate.
I've since started using the Unicolor kit, mostly because it's cheaper :P At first I weighed out 1/2 the powder to continue using 500mL working solutions, but then I decided that it's pretty stupid to do that and now I just mix up the full liter. Also, I strongly advise EXCELLENT ventilation when opening, measuring, mixing, even looking at the blix powders. I wouldn't be surprised if I took a few years off my life that first time I poured it out in a completely airtight bathroom :o
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I wouldn't be surprised if I took a few years off my life that first time I poured it out in a completely airtight bathroom :o
Haha! That took me back to my first organic chem lab. I opened a bottle of ammonium hydroxide outside of the hood. The fumes were like a punch in the face. Always work in well ventilated areas boys and girls!
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I'd theorized about cutting the chemicals in dry form but instead I mixed up the whole liter in liquid form, then I halved that and stored each half in 500mL bottles. That seems to work well and without any experience of noxious fumes (though of course I do the initial mixing in a well ventilated room and at arm's length).
I just compared the Unicolor instructions with Reinhold's results and they coincide very neatly. If you look at the rotary-tube developing chart, you'll see that they admit that you can develop at different temperatures by varying developing times. I don't know if the Tetenal kits have this, but it's clealy printed in the Unicolor instructions. Tried to attach the pdf but it's too big--you can find the instructions on Freestyle's site.
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BALLS. I liked the 1 litre kits. Bloody EU.
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BALLS. I liked the 1 litre kits. Bloody EU.
what did I miss? how is EU involved in this? a regulation against 1 litre c-41 kits? :P
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BALLS. I liked the 1 litre kits. Bloody EU.
what did I miss? how is EU involved in this? a regulation against 1 litre c-41 kits? :P
The reason Tetenal are scrapping the 1litre kits is because of new EU environmental legislation regarding wrapping and labelling.