So how much time should I wash single and double weight paper using Hypo Clearing Agent and an archival [vertically separated] print washer? I cannot nail that down.
As I mentioned previously, the only way to be sure is to do a test. Thereafter, if nothing in your processing sequence changes you have it nailed down for ever.
My personal processing sequence is:
- Develop in Dokumol for 3 minutes
- Stop bath for 1 minute (I use frequently changed plain water)
- First fix bath Adox Rapid Fixer at 1 + 4 for 1 minute
- Second fix bath Adox Rapid Fixer at 1 + 4 for 1 minute
- Print goes into a vertical archival washer (each slot is completely separated from the others)
- At end of printing session, last print goes into washer
- After 5 minutes the total contents of the washer are dumped, refilled and washing continues for 10 minutes
- Print are then individually toned in Selenium toner and then placed into a holding tray
- Once all prints have been toned, holding tray water is dumped and fresh water is used to rinse the prints
- Prints then go into the washaid (Tetenal Lavaquick) for minimum of 5 minutes
- Prints directly into the archival washer and start clock
- After 10 minutes, total dump of water
- Refill and wash for 50 minutes
- Drain and place on screens to dry
I tested the efficacy of this sequence last year when I renovated the darkroom. The final test was total immersion of a several complete prints (from varying slots in the washer) in HT-2. This demonstrated that the prints had been thoroughly washed as there was absolutely no staining on the prints.
Now other people have reported different washing sequences and these may well be effective. However, without testing no one can be sure how effective their washing sequence is. We also do not know to what tolerances the manufactures are working when they suggest a washing sequence.
Therefore, the simple answer is for each person to do their own test. It doesn't take very long to do and, subject to no changes in fixer, washaid, water or washing sequence, you only have to do it once. So, for the investment of a little bit of time and paper, you can be sure that your own personal washing sequence is effective (or not and then you will have to test further of course).
In previous makeshift darkrooms where space was at a premium and I had no running water, I have washed prints in trays with multiple changes of water. Testing showed that this was also effective in thoroughly washing prints but somewhat time consuming. Going back to the OP's original question, the great advantage of a dedicated archival washer is that you can just leave it to get on with the job. It is not De Facto better than washing in trays but a great deal more convenient when more than a couple of prints are to be washed.
If water consumption is a significant factor where you live but you wish to use an archival washer, then you can follow the test recommended by Ansel Adams in "The Print". Which is to wash 1 print for 10 minutes and then immerse the whole print in the HT-2 bath. If this proves to be sufficient (no staining) then you can wash for 10 minutes in the future (although Adams recommends doubling the time to ensure a safety factor). If it proves to be insufficient wash another print for 20 minutes and then immerse the whole print in the HT-2 bath. Keep repeating the test with wash extended by 10 minutes until you achieve a time that produces absolutely no stain on the print when it is immersed in the HT-2 bath.
Bests,
David.
www.dsallen.de