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  1. #11
    Rock Poper's Avatar
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    May 2005
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    I bought just yer standard glass yestersay to test... a little 250x300 piece (8x10 with room to spare) - the only other type of glass they had on offer aside from the standard variety were UV blocking type glass and a ~10 times expensive 'X-Ray' glass for x-ray machines ...

  2. #12
    Sparky's Avatar
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    Jun 2005
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    Here is a general link for the glass type I was discussing... http://www.waterwhiteglass.com/

    I would like to recommend corning O211 for any azo-type contact printing. You might find your exposure times dropping to about a TENTH or less of what they were, depending on the iron content of the glass you were previously using. Normal clear float glass tends to block about 90% of UV range light.

    Check out the transmittance graph..!!!
    http://www.eriesci.com/custom/Cor0211-curveT.aspx

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