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  1. #11
    Ian Grant's Avatar
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    Quote Originally Posted by Rudeofus View Post
    Let's all agree that those who make Sodium Sulfite commercially usually don't resort to APUG for instructions ...
    And your point is ?

    On a smaller scale it's still an easy way to make concentrated Sulphite solutions, and to overcome Geralds comments about heat and spalttering you carry out the addition of the hydroxide slowly.

    It's not rocket science and quite similar to making your own Sodium Metaborate (Kodalk) from Borax and Sodium Hydroxide which was quite normal outside the US where Metaborate was always harder to get hold of.

    Ian

  2. #12

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    Sodium Metabisulfite vs Sodium Sulfite

    Quote Originally Posted by Ian Grant View Post
    And your point is ?

    On a smaller scale it's still an easy way to make concentrated Sulphite solutions, and to overcome Geralds comments about heat and spalttering you carry out the addition of the hydroxide slowly.

    It's not rocket science and quite similar to making your own Sodium Metaborate (Kodalk) from Borax and Sodium Hydroxide which was quite normal outside the US where Metaborate was always harder to get hold of.

    Ian
    We don't have kodalk here in Brazil. Thanks for this!


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  3. #13
    Rudeofus's Avatar
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    Quote Originally Posted by luizjorgemn View Post
    We don't have kodalk here in Brazil. Thanks for this!
    Look at Mike Wilde's precious posting for instructions on how to replace Kodalk with Borax and Sodium Hydroxide.
    Trying to be the best of whatever I am, even if what I am is no good.

  4. #14
    kb3lms's Avatar
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    You can go through sulfite pretty fast mixing developers to try different ones. Anyway, I don't have a problem buying sulfite, just have this 5 pound bag of the metabisulfite that I'd like to use up. NaOH I have as well so using a bit to convert the MBS in small quantities might be doable. Till it gets used for some other things as well, that ought to take care of it. Thanks!
    All this has happened before, and all this will happen again.

  5. #15

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    Sodium Metabisulfite vs Sodium Sulfite

    Quote Originally Posted by Rudeofus View Post
    Look at Mike Wilde's precious posting for instructions on how to replace Kodalk with Borax and Sodium Hydroxide.
    Really precious adice. Thanks very much!!!


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  6. #16
    c6h6o3's Avatar
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    Not worth it at all. Why make it so tough on yourself? Sodium sulfite is about $1.50/lb.
    Jim

  7. #17
    Rudeofus's Avatar
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    Jim, a chemical that you have sitting around unused and with no future purpose is basically free. That's hard to beat!
    Trying to be the best of whatever I am, even if what I am is no good.

  8. #18

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    I wonder if those in the US realise how relatively easy and inexpensive it seems to be to obtain raw chemicals there.
    Much more difficult in the UK, can't speak for the rest of Europe
    examples: Sulfite comes in at about $6 /500g, while I've just seen Metaborate at $45 /500g from one of our (few) photographic chemistry suppliers.

  9. #19
    c6h6o3's Avatar
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    Quote Originally Posted by Rudeofus View Post
    Jim, a chemical that you have sitting around unused and with no future purpose is basically free. That's hard to beat!
    It's far from free when you factor in the time, trouble and perhaps other chemicals needed to convert it. And the OP lives in the US. Converting sodium metabisulfite to sodium sulfite rather than buying some is what I would have to call "penny wise and pound foolish".
    Jim

  10. #20

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    It's only free if you think that your time and effort isn't worth anything.
    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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