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Thread: A Twofer...

  1. #1
    Premium Member
    Join Date
    Nov 2006
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    Default A Twofer...

    Two questions:

    1. I was printing last night, I had burned the screen, washed it out, and let it dry. Everything looked good I taped up the sides, started to print, the first 5 or so went well, then the emulsion on the screen started to stick to the paper. So when I lifted the screen some of the edges of emulsion were sticking to the paper and pulling off. It started in one area which luckily I was able to fix with tape, but then other areas started to do the same thing. They would bubble a little then start to get tacky and stick to the paper.

    Any thoughts? Bad emulsion? I had to lengthen my exposure time because the screen kept washing out.

    2. Glass for an exposure box. Right now I have a temporary light box consisting of two 500 watt work lights set in the bottom of a large tupperware box, which I set a piece of glass on, then my transparencies, then my screen, then some weight. And I have broken about 3 pieces of glass due to the weight I put on (which isn't much, but I want enough to keep the transparencies and the screen tight).

    Where can I get a thick piece of glass that doesn't have any UV coating at a reasonable price?

  2. #2

    Join Date
    Dec 2007
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    Default

    Call a local glass shop. Most places, especially major cities, will be able to order a custom cut piece of glass, with rounded edges (saves blood) and the least thickness you want is 1/4 inch. 1/4 can hold 20 lbs-ish evenly distributed which should be more than enough.

    Make sure you call several glass shops because the prices will be a wide range. The glass I just bought was priced from 90 to 225. Be smart. Buy cheap. Glass is glass.

  3. #3

    Join Date
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    Default

    You can also check with a glass shop about "scraps" they have around the shop that might fit your exposure box. I found mine this way for $10.00.

  4. #4
    farleypig's Avatar

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    Default

    pillows on top of the screen then a tight lid to the lightbox? are you getting sticky emulsion mostly around the edges?
    i think sometimes our emulsion goes bad fast because it is too cold in the fridge or light leaks.

  5. #5
    Premium Member
    DenisMutter's Avatar


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    Default

    did you remove the safety glass from the halogen shop lights? those have some UV dealy in 'em usually.

    we string our halos from a pipe with some string and expose with the sceeen jelly side up on the floor - straight thru plain old window glass with some masking tape on the edges. beveled edges ain't how we roll in Dayton.
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  6. #6
    Conor IX's Avatar

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    Default

    I got a nice piece of A2 sized glass for about 30 Euro. I broke one piece from not cooling the glass down with a fan when exposing and leaving it for too long. I say make a better box or just go the way Dennis does it.

  7. #7
    Premium Member
    crosshair's Avatar


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    Default

    You need 1/4" thick tempered glass if it's going to bear weight/pressure/temperature changes.
    It isn't cheap, but then breaking multiple sheets of untempered glass isn't cheap either.
    Order it cut to size from a glass place and have them temper it.

    One of the popular myths always making the rounds at GP is that "you can't use tempered glass for exposure because it blocks UV."
    This is false.

    You probably want to avoid UV-coated architectural glass, but this is not the same thing.
    Crosshair pushing here until its limit the bringing together.

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