srs5694 said:The paper's own instructions say to wash for 90 minutes,
or for half that when using a hypo clearing agent. My bottle
of Zonal Pro washing agent, though, says to do a 5-minute
wash followed by a 10-minute soak in the washing agent
followed by a second 5-minute wash.
Zonal Pro ... it's got ammonium bisulfite and sodium hydroxide
srs5694 said:I've been using RC paper since starting to do my own B&W enlargements a few months ago, but today I received my first batch of FB paper (Oriental VC-FB II). I've noticed a rather huge difference in advice regarding washing this paper, though. The paper's own instructions say to wash for 90 minutes, or for half that when using a hypo clearing agent. My bottle of Zonal Pro washing agent, though, says to do a 5-minute wash followed by a 10-minute soak in the washing agent followed by a second 5-minute wash. So basically, which procedure should I follow (or should I do something else entirely)? The Zonal Pro seems to have an unusual composition; according to the label, it's got ammonium bisulfite and sodium hydroxide. Ordinarily I'd follow the paper manufacturer's recommendation, but that composition might well be relevant. Thanks for any advice.
I would like to see test data that supports the claims (Clean water and aggitation (sic) ) you madeLowell Huff said:Washing anymore than ten minutes is a waste of time for either RC or Fiber papers. Acid or alkaline fixers, make no difference to wash time. Clean water and aggitation is the key.
Tom Hoskinson said:I would like to see test data that supports the claims (Clean water and aggitation (sic) ) you made
From my own experience and testing, I agree, PE! and I also recommend Grant Haist (Modern Photographic Processing) as a very valuable information source on the subject of photographic fixing and washing.Photo Engineer said:I have run extensive fix and wash time comparisons with various fixes from pH 4.5 up to 9. I find both the fix time and the wash time vary as described in Anchell and Troop and of course in Haist, the source of information on alkaline fixes and the effect of pH on fix rate and wash rate.
I have used in my tests, both FB and RC (Ilford and EK products as well as other less well known brands). My tests included fix times of 15", 30", 1', 2', 4, and 8' and similar wash times out to 20 mins.
My data do not agree with the statement made by Lowell Huff.
However, you can wash any kind of paper too thoroughly and actually worsen print stability as described in the excellent article on this subject by Ctein. Overwashing removes the extra protection supplied by the small residual amount of sulfur compounds which protect the silver image by reacting with it to form a protective sulfide coat. This is akin to toning. It is also similar to the effect afforded by using something like Sistan in your process.
PE
I use an alkaline fixer an not Hypo Clear washing for 30-minutes. The paper tested ok.voceumana said:Wash time depends upon the fixer you use.
Photo Engineer said:However, you can wash any kind of paper too thoroughly and actually worsen print stability as described in the excellent article on this subject by Ctein. Overwashing removes the extra protection supplied by the small residual amount of sulfur compounds which protect the silver image by reacting with it to form a protective sulfide coat. This is akin to toning. It is also similar to the effect afforded by using something like Sistan in your process.
PE
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