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  1. #11

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    Not all air pollution is particulates. There are also dissolved gases; sulfur dioxide, various oxides of nitrogen, hydrocarbons, etc.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  2. #12
    fotch's Avatar
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    Quote Originally Posted by Gerald C Koch View Post
    Even if you live in an area with very hard water you can soften it by vigorously boiling tapwater for 5 minutes and allowing it to stand overnight. The temporary hardness (calcium ions) will precipitate out. The permanent hardness (magnessium ios) have no effect on photographic uses. The next day decant or filter off of the clear portion for use in developers.
    I would think the cost of heating, boiling water would exceed the cost of just buying distilled water, unless it just not available where you live.
    Items for sale or trade at www.Camera35.com

  3. #13
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    is rainwater comparable to demineralised water?

    Quote Originally Posted by adelorenzo View Post
    I only drink distilled water, or rainwater, and only pure grain alcohol.
    "I do not avoid women, Mandrake...but I do deny them my essence."

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  4. #14
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    Quote Originally Posted by drumlin View Post
    "I do not avoid women, Mandrake...but I do deny them my essence."
    POE
    Rafal Lukawiecki
    See rafal.net | Read rafal.net/articles

  5. #15
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    I used rain water to develop negs in Austrailia. The house on the farm was no longer being used (but made a decent darkroom until the lightning storm came by). I had to use milk filters to filter out the various larve, but the negs came out fine. I had to stop while the storm was nearby, as the window coverings were not 100% light tight.
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

  6. #16
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    Ash,

    My darkroom only uses tank water. Came about as a result of our water restrictions we had several years back.

    The tank water goes through four filters. A 20Ám washable screen filter takes out all the big bits from the tank water and this water is also used for the toilet and washing machine. Then in the darkroom there is an under sink unit with a 1Ám wound fibre to get rid of the sediment, a mixed bed resin filter for heavy metals (there is a lot of lead on my roof) and finally 0.5Ám carbon block filter. I change the filters in the darkroom every 12 months.

    It works for me. But I have never measured the pH nor have I bothered to see what might still be there.
    Cheers - Andy C
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    16mm Cine, 35mm, 120, 5x4 & 7x5.

  7. #17

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    Quote Originally Posted by fotch View Post
    I would think the cost of heating, boiling water would exceed the cost of just buying distilled water, unless it just not available where you live.
    It would all depend on how much each person pays for electricity or gas. Distilled/de-ionized water runs $1.00 to $2.00 per gal here in the US. Ads for electric home distilling machines claim to produce a gallon for $0.25. So boiling a gallon of water for 5 min should certainly cost far less than this. From a similar thread not so long ago some people in Europe pay exorbitant prices for distilled water if it is availale at all. .
    Last edited by Gerald C Koch; 02-18-2013 at 12:03 AM. Click to view previous post history.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  8. #18
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    Quote Originally Posted by Oxleyroad View Post
    Ash,

    My darkroom only uses tank water. Came about as a result of our water restrictions we had several years back.

    The tank water goes through four filters. A 20Ám washable screen filter takes out all the big bits from the tank water and this water is also used for the toilet and washing machine. Then in the darkroom there is an under sink unit with a 1Ám wound fibre to get rid of the sediment, a mixed bed resin filter for heavy metals (there is a lot of lead on my roof) and finally 0.5Ám carbon block filter. I change the filters in the darkroom every 12 months.

    It works for me. But I have never measured the pH nor have I bothered to see what might still be there.
    Thanks Andy,

    For general all purpose chemical dilution and mixing, I use filtered tap water, except for doing colour. I have always used Demin water for the final rinse when developing film. I have found that this is the best way to ensure clean streak free negs. I had thought of using demin for the whole process, but the price of buying 4 litres at a time has put me off.

    I believe Polyglot uses bottled spring water (for the chems at least), but I believe his tap water is really quite bad.

  9. #19

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    Quote Originally Posted by Gerald C Koch View Post
    Even if you live in an area with very hard water you can soften it by vigorously boiling tapwater for 5 minutes and allowing it to stand overnight. The temporary hardness (calcium ions) will precipitate out. The permanent hardness (magnessium ios) have no effect on photographic uses. The next day decant or filter off of the clear portion for use in developers.

    Incorrect. Boiling the water increases the hardness up until you reach the saturation point, and then salts will begin to precipitate out. You will be left with severely hard water.

    Magnesium and calcium ions act have almost the same reactivity.

  10. #20

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    Quote Originally Posted by RattyMouse View Post
    Incorrect. Boiling the water increases the hardness up until you reach the saturation point, and then salts will begin to precipitate out. You will be left with severely hard water.

    Magnesium and calcium ions act have almost the same reactivity.
    ??? NO on all counts.

    The temporary hardness in ground water comes from the presence of soluble calcium bicarbonate. When the water is boiled briefly this compound decomposes to form calcium carbonate which is insoluble. All cacium salts are effectively removed from the water. Calcium in water used in photographic solutions can causes problems with high sulfite containing developers like D-76 where it precipitates out as calcium sulfite and in carbinate containing developers like D-72.

    Magnesium compounds are soluble and only affect water when soaps are used for washing. Both calcium and magnesium form insoluble soaps which stick to cloth fibers. Magesium salts in water are not a concern in photography.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

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