Gevaert 504

Discussion in 'B&W: Film, Paper, Chemistry' started by piticu, Oct 11, 2011.

  1. piticu

    piticu Member

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    Does anybody has a different formula for this reducer?

    Mine is from “Gevaert manual of photography”, fifth ed rev, 1962 and it says:

    Ammonium persulphate 20grams
    Sulphuric acid conc. 10drops
    Water to make 1liter​

    Any help will be much appreciated.
     
  2. Ian Grant

    Ian Grant Subscriber

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    That's the correct fomula for the Gevaert Persuphate bleach, it's the same in earlier editions. Can't check the 1st 1938 that must be on my shelf in Turkey.

    Ian
     
  3. piticu

    piticu Member

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    Thanks a lot Ian. It will be correct to say that 10drops equal 2.5 mililiters?
     
    Last edited by a moderator: Oct 11, 2011
  4. Ian Grant

    Ian Grant Subscriber

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    I've found I do have the 1st edition here taht gives volumes in UK avoirdupois, I'll try and convert accurately later when I have more time. There is a conversion for drops to actual volume, but it's best left as drops.

    Ian
     
  5. piticu

    piticu Member

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    Many thanks again Ian. Looking forward