Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,472   Posts: 1,570,965   Online: 816
      
Page 4 of 7 FirstFirst 1234567 LastLast
Results 31 to 40 of 69

Thread: Water quality

  1. #31
    johnnywalker's Avatar
    Join Date
    Sep 2002
    Location
    British Columbia, Canada
    Shooter
    Multi Format
    Posts
    2,256
    Images
    78
    Quote Originally Posted by modafoto
    About water:

    A wise danish man onde said:

    [COLOR=DarkSlateGray][SIZE=3][FONT=Lucida Console]"I will not drink something a long-haired hippie once walked on..."[/FONT][/SIZE][/COLOR]

    And God only knows what the fish do in it!
    If I had been present at the creation, I would have given some useful hints for the better arrangement of the Universe.
    Alfonso the Wise, 1221-1284

  2. #32
    John_Brewer's Avatar
    Join Date
    Apr 2004
    Location
    Bristol, UK
    Shooter
    8x10 Format
    Posts
    454
    Images
    18
    Quote Originally Posted by Dave Miller
    I can confirm this, I now use bottled water from my local Tesco supermarket. At 18p per litre it doesn't add much to the cost of film developing, but does save on spotting time.
    That's a good idea i'll use from now on. Much cheaper than de-ionised water. The water in Bristol is so hard it almost comes out the tap in lumps! Make great tea though.
    ~John~
    --------------------------
    www.johnbrewerphotography.com
    There are 10 types of people in this world - those who understand binary and those who don't.

  3. #33
    Aggie's Avatar
    Join Date
    Jan 2003
    Location
    So. Utah
    Shooter
    Multi Format
    Posts
    4,925
    Images
    6
    Morten, In the late 60's I was refused water on a ferry to Copenhagen. They told me I could habe beer or soda vand, becasue water is what the ship was sailing in.
    Non Digital Diva

  4. #34

    Join Date
    Jun 2004
    Location
    Portland, OR
    Shooter
    4x5 Format
    Posts
    3,268
    Quote Originally Posted by GeorgesGiralt
    Hi Dave and Jim !
    Boilling water remove hardness
    This statement is wrong. Hardness is defined as the combined concentration of calcium and magnesium ions in the water. Boiling will not remove these ions from water.

    Kirk - www.keyesphoto.com

  5. #35

    Join Date
    Sep 2004
    Location
    Bloomington, IN
    Shooter
    Multi Format
    Posts
    47
    So, here's a question from someone who's been doing a lot of dfilm evelopment at home and is trying to settle down his techniques to a consistent grind:

    I've been using distilled water for all chemistry mixing, prewets, rinsing, etc to avoid any problems, and have had good luck with avoiding particulates on my negs, spotting, etc. However, as you can imagine, the costs of distilled water, while not earth-shattering, are also not insignificant.

    I've been considering refilling my distilled bottles with filtered water from the supermarket (much cheaper), which should deal with the particulates. Is this a good/bad idea?

    If I were to test either this filtered water, or my tap water, for its suitability in photographic uses, how should I test it (I'm assuming PH strips would be a good start), and what should I test for? Could taking my water to the local water authority for an analysis be a good step as well?

  6. #36
    jp80874's Avatar
    Join Date
    Jul 2004
    Location
    Bath, OH 44210 USA
    Shooter
    ULarge Format
    Posts
    3,442
    Images
    6
    Try using distilled in just the final wash as I mentioned above. This cleaned up the small amount of grit I had and probably cut the price by 95%.

    John Powers

  7. #37
    Bob F.'s Avatar
    Join Date
    Oct 2004
    Location
    London
    Shooter
    Multi Format
    Posts
    3,984
    Images
    19
    Boiling will make some of the minerals fall out as a precipitate which can be filtered out. Possibly the ions recombine at the higher energy levels to form solids? - dunno, not a chemist, but it does happen - have a look in the bottom of your kettle. Don't know what percentage of minerals are extracted in this manner tho...

    Boiling drives out oxygen and other gasses such as chlorine and whatever other gunk the authorities put in the water to make it safe to drink, and kills live organisms. Personally, I use whatever comes out the tap except for mixing stock solutions and a final film rinse, for which I use de-ionised water from the local car spares centre. Possibly if I was more concerned, I would use it for making up the working solutions and pre-soak too, but I'm not, so I don't... I did get drying marks occasionally before I started using de-ionised (+ wetting agent) for a final rinse but do not any more.

    Cheers, Bob.

  8. #38
    gainer's Avatar
    Join Date
    Sep 2002
    Posts
    3,726
    Images
    2
    Quote Originally Posted by Kirk Keyes
    This statement is wrong. Hardness is defined as the combined concentration of calcium and magnesium ions in the water. Boiling will not remove these ions from water.

    Kirk - www.keyesphoto.com
    That of course explains why the pot I boil water in is always coated with white stuff. Only the molecules are removed, not the ions.
    Gadget Gainer

  9. #39
    Ole
    Ole is offline
    Ole's Avatar
    Join Date
    Sep 2002
    Location
    Bergen, Norway
    Shooter
    Large Format
    Posts
    9,282
    Blog Entries
    1
    Images
    31
    Quote Originally Posted by gainer
    That of course explains why the pot I boil water in is always coated with white stuff. Only the molecules are removed, not the ions.
    Boiling water vaporises some of it, raising the concentration of salts. Boil emough (or have hard enough water), and you get a saturated solution with some salts falling out as solids. So even if some solids are removed, the water ends up with MORE salts in it.

    There are also some salts that are more soluble in cold water than in hot - gypsum (calcium sulfate) is an example. Heating water with dissolved gypsum makes a lot of it fall out. Some of it can then dissolve again as the water cools...
    -- Ole Tjugen, Luddite Elitist
    Norway

  10. #40
    Shmoo's Avatar
    Join Date
    Nov 2003
    Location
    Southern California
    Shooter
    4x5 Format
    Posts
    972
    Images
    11
    Who would have thought that water theory would come up with so much info? Oh well, for what it's worth, I found that I only need distilled water for the final rinse. Using the distilled water in the rest of the procedure caused me to under fix my film (purple-pinkies). Using the same fix bottle with regular tap on another set of the same type of film did not result in this problem. Go figure...

    S

Page 4 of 7 FirstFirst 1234567 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin