Using a stop bath is much safer than a wash step alone, if you do a light reversal.
But because the wash step after FD is more or less part of the process, in meaning of gradually tapering off the FD activity, I would recommend 2 min wash first, than 2 min stop and then the reversal exposure. After this one may have think about a wash step again, to get rid of the acid / acid carryover in the CD…
The alternative would be your prolonged/extended wash, something about 4-5 min. including your “air knife” after FD. In terms of needed tank capacity it would be quite the same…
My procedure is 2 min wash, 2 min stop, again 2 min wash, than 4min light reversal. Because I do only drum processing in a Jobo, after the light reversal follows again a short wash/prewarm step prior CD, to maintain desired temperature in the drum… And again, this light reversal works pretty perfect and as you stated already, there is one chemical bath less to take care about.
Because of homebrewing this is my main argument for this processing variant…
Last edited by stefan4u; 04-06-2013 at 08:44 AM. Click to view previous post history.