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  1. #1

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    pyrocat hd with metol - order of mixing

    hi ,

    was going to start mixing this up when i started getting paranoid about the order it should be mixed! so... does the metol ( substituting for the phenidone ) go first?


    thanking you all in advance ...

  2. #2

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    Yes, metol goes first as it has a hard time dissolving in sulfite solutions.

  3. #3
    Jim Noel's Avatar
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    To ease the dissolving of metol, first dissolve a pinch of sulfite, then the metol. Although metol does not dissolve easily in a sulfite solution, a small pinch helps it dissolve better than in plain water.
    [FONT=Comic Sans MS]Films NOT Dead - Just getting fixed![/FONT]

  4. #4

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    Quote Originally Posted by Jim Noel View Post
    To ease the dissolving of metol, first dissolve a pinch of sulfite, then the metol. Although metol does not dissolve easily in a sulfite solution, a small pinch helps it dissolve better than in plain water.
    I may be wrong here, but I always thought that the reason for putting a pinch of sulfite in first was to absorb any O2 present in the water, thus making the metol last a bit longer. IMHO, metol will dissolve faster in plain water than it will in water with any sulfite.

  5. #5
    gainer's Avatar
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    Pyrocat HD uses catechol, phenidone and sulfite.
    I think you will be happier if you make a batch of Pyrocat MC in glycol. I have to leave now.
    Gadget Gainer

  6. #6

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    love it! hit and run advice!

    i'm in australia and i'm not sure if we 've got glycol up here...


    why mc over hd mr pg ?

  7. #7

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    Quote Originally Posted by el wacho View Post
    love it! hit and run advice!

    i'm in australia and i'm not sure if we 've got glycol up here...

    why mc over hd mr pg ?
    The metol and phenidone are more stable in non-aqueous solution. The glycol mentioned is propylene glycol (1,2-propanediol), which is used as a solvent in the food and pharmaceuticals industries, and a non-toxic anti-freeze.
    Steve

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  8. #8

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    Right or wrong I have always mixed the components in order as listed and never had any problems ever and I do use metol.

    Pyrocat-HD
    Stock Solution A
    Distilled Water 75 ml
    Sodium Metabisulfite 1.0 g
    Pyrocatechin 5.0 g
    Phenidone 0 .2 g*
    Potassium Bromide 0 .2 g
    Distilled water to make 100 ml

    Stock Solution B
    Distilled Water 70 ml

  9. #9

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    Snallan,

    Do you get your propylene glycol from a publicly available source?

    Tom.

  10. #10

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    I have to admit, I use the water based HD version. Since Rayco closed their doors, I have found it difficult finding liquid chemicals from the normal suppliers.

    One who might be able to help is Fotospeed, but you will need to phone or email them for details, as they do not list raw chemicals online.

    On the other hand, I know aqueous solutions are less stable, but I am still using a batch of HD made last April and it is fine.
    Steve

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