Double coating paper?

Discussion in 'Alternative Processes' started by Kimberly Anderson, Jan 14, 2006.

  1. Kimberly Anderson

    Kimberly Anderson Member

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    Kerik,

    I'm getting ready to do some VDB printing with Platine myself. Do you recommend going straight to the double coating? My paper is stored indoors in my basement, which is dry, but cold.

    Also, regarding the hair dryer, why do you recommend that it is not hot? I had not heard that before, and could use your experience before I start burning up the paper/solution.

    Thanks man!
     
  2. CarlRadford

    CarlRadford Member

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    I have started to double coat my paper - arches platine - as this appears to resolve an issue with the density of the blacks. I think it maybe that the paper being stored in the darkroom could get a little damp and may inhibit the solution being taken up by the paper and thus leaving me with a lot of solution that isn't being absorbed. I will start to bring the paper into the house and see if this makes a difference. However, if double coating should the solution be let to dry - even hair dired - before applying the seconed coat?

    Thanks folks, Carl.
     
  3. Kerik

    Kerik Member

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    Carl,

    Damp paper will usually suck up the sensitizer quicker than dry paper. It's easier for moisture to flow along already moist paths rather than when the paper is completey dry.

    Platine is a paper that usually does benefit from double-coating, depending on the image. It's best to dry it completely prior to applying the second coat. Yes, a hair dryer is fine as long as it's not HOT.

    (BTW - PM coming soon...)
     
  4. CarlRadford

    CarlRadford Member

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    Not HOT?

    I have been using a HOT hair dryer - I did notice a distinct change in colour as I was drying the paper to a darker orange as opposed to a yellow? Prints appear to be ok - currently drying, I'll scan and post when dry but these are pinhole images and so not to everyones taste here :smile:

    Take care, Carl
     
  5. Dave Miller

    Dave Miller Member

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    I doubt that anything is to everyone’s taste Carl; so don’t feel inhibited about posting your images.
     
  6. Dave Miller

    Dave Miller Member

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    Carl, your reference to HOT hair dryer rang an alarm bell; so I just checked in the book Silver Gelatin where they refer to gentle heating to accelerate drying. Excessive heat may introduce reticulation they say.
     
  7. Kerik

    Kerik Member

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    Too much heat with pt/pd printing can cause fogging. If that's not happening, you're probably OK. As for VDB, I'm not sure since I've never used that process.
     
  8. donbga

    donbga Member

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    Michael,

    Regardless of paper type or brand always double coat VDB. Let the first coat dry first before applying the second. Hot air can cuase the sensitiser to fog or have a splotchy effect.

    Look at the bright side of VDB printing and double coating, it's inexpensive.

    Don Bryant
     
  9. Thomassauerwein

    Thomassauerwein Member

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    Just a little input. I tested both double coating and single side by side. Yes there was an increase in saturation. But I found also that by using a bit more coating material for the first coat. (being careful not to splatter) I used less metal and got the same effect. A bit more care in the application of the emulsion is very important to avoid splotching and density variance but it does work really well. Also keeping the emulsion cool during exposure with fans worked great for increased sharpness or less paper fog.
     
  10. Phillip P. Dimor

    Phillip P. Dimor Member

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    I'd been using the sun as my UV source and well.. My prints on a hot day turned out orange-brown.. Today was a chilly but bright day and I got beautiful dark brown tones. I'm believing that the heat has a lot to do with the orange-brown tone.

    I tried using one coat like I do with cyanotypes but quickly found that two coats really gives you a more even (and dense) image.

    I use a flat watercolor brush with a good edge. Everyone recommends the Richeson 9010 brush and it looks like a wonderful brush. I use a $4 special from Michaels arts and crafts. It's 3/4" wide and is perfect for me with 4x6's. Dampen it a little and the solution just goes on nice and evenly.

    I also add one to two drops of glycerine (stuff you use with cake frosting and cooking)
    to aid in coating. I can coat about 4 layers onto the Cranes paper without it soaking through the paper. *shrug*
     
  11. donbga

    donbga Member

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    Which Cranes paper are you using? The paper sounds like it is too dry. I would be cautious about using glycerine since it could cause mould growth later on. You will be much better off using a surficant such as Tween 20 to help coat the paper.

    Don Bryant
     
  12. Phillip P. Dimor

    Phillip P. Dimor Member

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    Kid Finish Ecru white. Never thought about mold :sad:
     
  13. donbga

    donbga Member

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    After making my post I thought about using glycerine some more. I've used glycerine to brush develop pure platinum prints and that technique has been used in years past, so it might not be such a bad thing to do.

    Don Bryant