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  1. #1

    Join Date
    Mar 2009
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    Plastic Cameras
    Posts
    3

    how to size paper ?

    Hello everyone,

    I would like to know how can i cover Guar gum on the surface of my normal printable paper

    Is there any simple method to do that ? ( I don't have sophisiticated tools with me :S but i ask this because i heard that gum protects the paper )

    Thank you guys !

  2. #2

    Join Date
    Mar 2006
    Location
    Connecticut
    Shooter
    Large Format
    Posts
    67
    Use gelatin (Knox's or photo grade, 200 -250 bloom). Put 30 grams in 500 ml distilled water. Allow to swell for 20 minutes. Heat over a double boiler until gelatin has melted. Apply by foam brush, coating blade, or immersion. hang to dry. If double coating, you must harden the intiial coating with formalin or gyloxol.

    NWG

  3. #3

    Join Date
    Jan 2007
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    4x5 Format
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    252
    Hemphrey, your choice of sizing material intrigues me. Why are you thinking of guar gum? I've never heard of anyone using it for a size, but that doesn't mean I don't think it would work, it just means you may need to do the legwork yourself as far as experimenting with it. And what process do you want to print on the sized paper? For gum printing, gum arabic can work as a size if it's crosslinked so so as not to be soluble in water. Some people mix it with dichromate and expose it to light to crosslink it; that's more trouble than I want to go to and I crosslink it by mixing it with glyoxal when I've used gum arabic as a size. Not being familiar with guar gum I have no idea how similar it is to gum arabic in structure, solubility, or how well it crosslinks as a dichromated colloid or with a crosslinking agent like glyoxal, so it's impossible to tell you how to use it as a size, sorry.
    Katharine



 

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