Spiral Tank Processing

[Larry S Moses]

I have some questions regarding at home Spiral Tank processing. I have been mixing 2 litres of chemistry for 100' rolls of color reversal(ORWO/Svema & Kodak E-6) and, just recently, color negative(ECN-2) 16mm film. After running the first devloper, the solution is sometimes black and seems to effect the image of the bottom 50' layer of film (dark and muddy). Should I only run 50' at a time at the top spiral? Should agitation be constant to mix chemistry, or maybe try to filter the developer before running the other 50'? You advice would be greatly appreciated.

Thanks

[Simon Wyss]

The black backing comes off the film. Remove it before processing. Internet search rem jet removal

[Larry S Moses]

Thanks, Simon. On the color negative, I believed the remjet may be the issue. This also happens with the reversal film as well, which does not require remjet removal.

[Simon Wyss]

Oh, yes, reversal colour films have a jet-black backing as well.

[Larry S Moses]

Thanks. Do you know if the old Soviet-era filmstocks Svema and ORWO have remjet?

[Simon Wyss]

No, I don’t, but most probably they have. ORWO rather than Svema