I use both Kodak HCA at 1+4 and 1% sulfite for hypo clearing solution, depending on which one is handy. I have not done any tests. 4-5 min in a solution, which follows 20-30 mins in a washer.Recently I've come across two formulae for wash aid. One involves putting a heaped teaspoon of Sodium Sulphite in one litre of water. The other, recommended by ADOX is a 1 % sodium carbonate solution. (Can anyone tell me how much sodium carbonate that would be in one litre?) Has anyone used either of these as a wash aid and then done a residual hypo test?
I use a self-made 2% solution of sodium sulfite(20g/liter of water)with 1g sodium hexametaphosphate(Calgon) and it passed my residual hypo test.Recently I've come across two formulae for wash aid. One involves putting a heaped teaspoon of Sodium Sulphite in one litre of water. The other, recommended by ADOX is a 1 % sodium carbonate solution. (Can anyone tell me how much sodium carbonate that would be in one litre?) Has anyone used either of these as a wash aid and then done a residual hypo test?
I use a self-made 2% solution of sodium sulfite(20g/liter of water)with 1g sodium hexametaphosphate(Calgon) and it passed my residual hypo test.
i would not use sodium carbonate... it will soften your emulsion without need...
you can use also the same amount of sodium chloride... a heaped table spoon to a liter of H2O...
I have a tiny electronic scale that I bought for around 10 USD at a coin dealer. It weighs, I believe up to 100 grams. It has all kinds of units, grams, grains, troy ounces, avoirdupois ounces, penny weight, carat etc. Comes in handy for mixing developers etc. I'm sure if you could continue to use a heaped teaspoon for a measure it would be fine. But if you want to calibrate your spoon, these come in handy.Thanks to all that replied, looks like Sodium Sulphite it is. That was the recommendation from the landmark article "Mysteries of the Vortex" in an old D&CCT.
i would not use sodium carbonate... it will soften your emulsion without need...
you can use also the same amount of sodium chloride... a heaped table spoon to a liter of H2O...
Mine comes from a photo chemical supplier in Hamburg and is called Photocalgon.I just add it when hard water is used to prevent calcium scum on negatives.Calgon is no longer Sodium hexametaphosphate so should not be used. In fact the ingredients of Calgon can differ quite a bit but it's definitely not suitable for Wash Aid.
Ian
this must be based on the old story that seawater was effectively used as washwater during WWII. BTWaverage sea water contains 3.5% NaCl. I saw it proposed as washing aid with an additiobal0.5% of sodium sulfite and it tested successfully in removing residual hypo in my tests but no netter than a 2 % sodium sulfite solution mixed 1+4.Does sodium chloride work for real?
I had read about it somewhere and have been using for the past few months without much faith in it, but is it true?
This sounds like a darn good idea. I've got some wide mouth "packer" bottles. As long as it's dry HCA will stay good.I only use HCA with film (as I almost always print on RC).
I dump the package contents into a small bottle. Each time I have a film developing session I shake up the bottle and then mix up some working solution - using a half teaspoon of powder in 600 ml of water each time. I discard the mixed solution after the session.
HCA is the only powdered chemical that I deal with this way. From what I can tell, it doesn't matter much for HCA if there are small variations in the relative amounts of the individual components.
but the question isThis sounds like a darn good idea. I've got some wide mouth "packer" bottles. As long as it's dry HCA will stay good.
Not trying to make you type out a Novel, but.....what is your basic washing procedure for film when using "Perma Wash".?I only use HCA with film (as I almost always print on RC).
I dump the package contents into a small bottle. Each time I have a film developing session I shake up the bottle and then mix up some working solution - using a half teaspoon of powder in 600 ml of water each time. I discard the mixed solution after the session.
HCA is the only powdered chemical that I deal with this way. From what I can tell, it doesn't matter much for HCA if there are small variations in the relative amounts of the individual components.
Not trying to make you type out a Novel, but.....what is your basic washing procedure for film when using "Perma Wash".?
Thank You
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