Nice machine you built there!
I’m doing a light reversal too, never found a problem in home development neither. But for commercial processing I do have 3-4 proposals why this is maybe not desired…
Perhaps a question of keeping the standards, in official E6 simply no light reversal step is destined. So a reversal process using light as reversal agent should be named different, something like E6-xy
As far as I know E6 was designed to have less ecological impact / use less wash steps as possible, to keep the (waste) water bill low. With optical reversal (in opposite to an slightly acidic reversal bath) you have to wash your Films better and use preferably a stop bath too, to exclude the possibility of unwanted silver development during reexposure.
A chemical reexposure is maybe easier to maintain, or can be controlled the very same way as all other steps. The higher densities in the final slide may reach uniformity better/easier this way in commercial processing.
In terms of designing developing machines, it may be more complicated to exclude light leaks, especially for the dip and dunk machines, during a light reversal step.
Last edited by stefan4u; 04-02-2013 at 08:42 AM. Click to view previous post history.