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Thread: rule of thumb

  1. #11

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    Thanks Ian, I'll have a look, but with Parodinal being fairly easy for me to make I was thinking of trying it out, those dilutions will be my starting point. Thanks!

  2. #12
    RalphLambrecht's Avatar
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    Quote Originally Posted by RidingWaves View Post
    Thanks Ian, I'll have a look, but with Parodinal being fairly easy for me to make I was thinking of trying it out, those dilutions will be my starting point. Thanks!
    can you post a formuls for parodinal? i couldn't find one.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  3. #13
    dmb
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    http://www.digitaltruth.com/data/parodinal.php - Acetaminophen (better known as paracetamol or tylenol)

  4. #14
    Ken Nadvornick's Avatar
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    I have never been able to get that sulfite ratio of 200 grams/liter to come even close to dissolving completely, even at elevated temperatures. Cutting that ratio in half (25 grams/250 ml) has always seemed to work out much better.

    Had a small (thin plastic) drinking water bottle holding an older batch. Let it sit for about a year - maybe - just to see what would happen over time. The hydroxide finally ate a hole in the side. Dripped solution, which immediately turned blackish, all over everything. What a huge mess. I shoulda' known better...



    Ken
    "There is very limited audience for the arty stuff, and it is largely comprised of other arty types, most of whom have no money to spend because no one is buying their stuff either. More people bring their emotions to an image than bring their intellect. The former are the folks who have checkbooks because they are engineers, accountants, and bankers—and generally they are engineers, accountants and bankers because they are not artists."

    — Amanda Tomlin, Looking Glass Magazine, 2014

  5. #15
    Ian Grant's Avatar
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    Quote Originally Posted by Ken Nadvornick View Post
    I have never been able to get that sulfite ratio of 200 grams/liter to come even close to dissolving completely, even at elevated temperatures. Cutting that ratio in half (25 grams/250 ml) has always seemed to work out much better.

    Had a small (thin plastic) drinking water bottle holding an older batch. Let it sit for about a year - maybe - just to see what would happen over time. The hydroxide finally ate a hole in the side. Dripped solution, which immediately turned blackish, all over everything. What a huge mess. I shoulda' known better...



    Ken
    Concentrated solutions of Sulphite are best made from Sodium or Potassium Metabisulphite and Hydroxide.

    Ian

  6. #16
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    Sodium sulfite
    From Wikipedia, the free encyclopedia
    Sodium sulfite


    anhydrous

    hydrate
    IUPAC name[hide]
    Sodium sulfite
    Other names[hide]
    Hypo clear (photography)
    E221
    Identifiers
    CAS number 7757-83-7
    PubChem 24437
    ChemSpider 22845
    UNII VTK01UQK3G
    RTECS number WE2150000
    Jmol-3D images Image 1
    SMILES
    [show]
    InChI
    [show]
    Properties
    Molecular formula Na2SO3
    Molar mass 126.043 g/mol
    Appearance white solid
    Density 2.633 g/cm3 (anhydrous)
    1.561 g/cm3 (heptahydrate)
    Melting point
    33.4 °C (dehydration of heptahydrate)
    500 °C (anhydrous)
    Boiling point
    Decomposes(separate (substances) into constituent elements)
    Solubility in water 678 g/L (18 °C, heptahydrate)
    according to wikepedia, the solubility of sodium sulfite in 18cwater is above 600g/l
    Sodium sulfite
    From Wikipedia, the free encyclopedia
    Sodium sulfite


    anhydrous

    hydrate
    IUPAC name[hide]
    Sodium sulfite
    Other names[hide]
    Hypo clear (photography)
    E221
    Identifiers
    CAS number 7757-83-7
    PubChem 24437
    ChemSpider 22845
    UNII VTK01UQK3G
    RTECS number WE2150000
    Jmol-3D images Image 1
    SMILES
    [show]
    InChI
    [show]
    Properties
    Molecular formula Na2SO3
    Molar mass 126.043 g/mol
    Appearance white solid
    Density 2.633 g/cm3 (anhydrous)
    1.561 g/cm3 (heptahydrate)
    Melting point
    33.4 °C (dehydration of heptahydrate)
    500 °C (anhydrous)
    Boiling point
    Decomposes(separate (substances) into constituent elements)
    Solubility in water 678 g/L (18 °C, heptahydrate)
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

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