% Solution

Discussion in 'B&W: Film, Paper, Chemistry' started by Bruce Osgood, Aug 12, 2003.

  1. Bruce Osgood

    Bruce Osgood Membership Council

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    The formula I have for Mytol (Xtol substitute) calls for 0.15 grams of Phenodine. My balance is not that accurate.

    How do you make a per-cent solution that would put 0.15 grams into the brew?

    Thank you for any suggestions,
     
  2. Black Dog

    Black Dog Member

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    Have a look in The Darkroom Cookbook (steve anchell) p28:

    water at 125f/52c 750 ml

    Sodium bisulfite 6g

    Phenidone 2g

    Cold water to make 1000ml


    100 ml of concentrate contains 0.2g of Phenidone . I've used this formula and it works a treat. Keeping qualities reasonable as long as you keep it cool (& try Tetenal Protectan spray)

    BD
     
  3. Jorge Oliveira

    Jorge Oliveira Member

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    Pat Gainer, of vit C fame, recommends solving it in pure isopropyl alcohol (1g/100cc alcohol) - no scent, colors, etc.
    I use it, don't know how long it lasts, but it works fine.

    In the long past I've used it with bisulphite - but I honestly do not remember how long it lasted...

    Jorge O
     
  4. Robert

    Robert Member

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    So how accurate is it? Let say you decide that you can measure 2 grams easily. Dissolve the 2grams into for example 100ml of water. You now know that 100ml of this solution would give you 2grams. 50 ml would give you 1gram. 10ml would be 0.2 grams. 7.5ml would be 0.15 grams.

    Now you can do the same thing with any amounts that are convient.