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  1. #1
    argentic's Avatar
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    Glycol, TEA and Glycerine

    Quote Originally Posted by gainer
    Safer glycols
    I found an auto supply store that had the safe propylene glycol antifreeze. It worked as well as the ethylene. Another benign solvent that works is glycerol (glycerine at the drug store), but it is very viscous, even more so than HC110 syrup.
    Hi PAt,

    could you elaborate a bit more on glycerol (glycerine)? This is a ready available substance here in Europe, and AFAIK it's the least toxic of the glycol / TEA family. If it practically works as a non-active developer solvent, it would be an ideal candidate for a very environmentally friendly Phenidon - Vit C developer.

    Gilbert
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    Cours photo en Auvergne

  2. #2

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    Quote Originally Posted by argentic
    Hi PAt,

    could you elaborate a bit more on glycerol (glycerine)? This is a ready available substance here in Europe, and AFAIK it's the least toxic of the glycol / TEA family. If it practically works as a non-active developer solvent, it would be an ideal candidate for a very environmentally friendly Phenidon - Vit C developer.

    Gilbert
    I tested several developers in propylene glycol, dipropylene glycol and glycerine. The characteristics of the developers were affected very little, if any, by the solution.

    However, glycerine is very viscous and I found this to be something of an inconvenience in use as it made precise measuring more complicated than with the two glycols.

    Sandy

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    Quote Originally Posted by argentic
    Hi PAt,

    could you elaborate a bit more on glycerol (glycerine)? This is a ready available substance here in Europe, and AFAIK it's the least toxic of the glycol / TEA family. If it practically works as a non-active developer solvent, it would be an ideal candidate for a very environmentally friendly Phenidon - Vit C developer.

    Gilbert
    Gilbert, Polyethylene Glycol (PEG) is a good choice for those looking for a low toxicity, environmentally friendly preservative and solvent. The viscosity of PEG is much lower than glycerine. In fact, the material properties of PEG closely resemble those of water.

    "Polyethylene glycol (PEG) is a water-soluble lubricant from petroleum and/or mineral sources. PEG may be used as a binding agent, coating agent, dispersing agent, flavoring adjuvant, and plasticizer. Supplement manufacturers use it as a processing aid in compression enabling the tablets to hold together better. It also protects nutrients in the tablet from air and humidity.

    PEG is approved for use under the 21 CFR 172.820, and 173.340. It can be added to carbonated beverages, citrus fruit, non-nutritive sweeteners, tablets, and vitamin or mineral preparations.

    Synonyms and Brand Names (selected): Carbowax, Lutrol, Alkapoly Peg-200, Jeffox, and Pluracol."


    http://www.wholefoods.com/healthinfo/peg.html
    Tom Hoskinson
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  4. #4
    gainer's Avatar
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    You could keep the glycerine warm. I do that with TEA in winter, as it freezes at about 70 F. I have what we call a brisker oven, used mainly for letting bread dough rise, that keeps a temperature around 100 F. I don't think glycerine is any less toxic than PEG, but it may have the advantage if you use USP glycerine in place of tech grade PEG. You can certainly try a small batch to see if the viscosity will be a problem for you. That would be the only reason for not using it.
    Gadget Gainer



 

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