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> Hypo Clear - problems |
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#11
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Quote:
Richard
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jerseyinblackandwhite.blogspot.com |
#12
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Hmmm. Sounds like a combination of cold and hard tap water. We are on the South Downs so lots of chalk and hard water.
So next question - mixing hypo clear in de-ionised water? Apparently it has a low pH. It is much cheaper than distilled water. Will it be OK for hypo clear? |
#13
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It might be cheaper, in the long term, to get a water filter of some kind, maybe a Britta water filter?
Richard
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jerseyinblackandwhite.blogspot.com |
#14
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Perhaps, but I've read that the carbon can escape into the water and cause spotting... We'll hang on, that would only matter for developers. Wouldn't make a difference to hypo-clear. Good suggestion.
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#15
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Quote:
Richard
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jerseyinblackandwhite.blogspot.com |
#16
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I'd have to look it up, as I only use FB papers occasionally, but from memory, I read somewhere that if you mix your own, it's best to mix fresh each time. I don't remember a reason ever being given, but maybe what seems to be happening to peoples solutions, is the reason why?
It's something like a teaspoon of SS per one litre of water if I remember. It's also possible to use Sodium Carbonate (Washing Soda), which I used for decades and prints from the 1970's which were washed with this, still look good! I'll have a browse of a couple of books soon and report back if I can find the info. Terry S |
#17
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Thanks Terry, that would be very helpful. A teaspoon at a time would suit much better. And washing soda would be cheaper still.
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#18
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An old formula for Hypo clear is water at 30 750l
sodium sulphite 20 water to make 1000 use for one session and discard, mix fresh every time in effect water at 30 degrees, add 20 grams of sodium sulphite, which is around 1 desertspoon full disolve in the water then add another 250ml of water, use for session then discard, clearing time is around 2-3 minutes at 20 degrees I used to use this formula and it worked, but it is now very hard to get the chemistry over here so I tend now to use Hypo clear bath from kodak. Richard
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jerseyinblackandwhite.blogspot.com |
#19
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I only ever make up hypo clear as I need it.
A couple of spoonful's of sodium sulphite into 750 mL of tap water at 30 C and when its dissolved add cold tap water to make 1 L. I throw it away at the end of a session. Regarding de-ionised water, I buy 5 L from Halfords for £3.75 and it leaves almost no residue when it dries - its the nearest thing to distilled water I can find. Martin |
#20
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Just checking The Darkroom Cookbook, it seems Richard is about right with his 20 grams of Sodium Sulfite (or Sulphite) per litre of water, with the solution being discarded after use. As stated by a few, dissolve in 750ml of warm water and top up to one litre with cold water to bring to temperature.
The formula given in the book says for a stock solution, use 200 grams of Sodium Sulfite in one litre of water, which is then diluted at 1 + 9. This would equal 20 grams of SS in a litre of working solution. Just checking, and 20 grams of SS is two SLIGHTLY rounded teaspoons. I have a kitchen set of stainless steel spoons for accuracy, and they are kept with my chemicals and are used for this use only! The freshly made one litre of solution can be used on up to 80 10x8 inch prints. Terry S |
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