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Thread: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

  1. #1

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    Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

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    Hello friends , is this glass negative colorful or because of backlighting ? I found pinks , blues , purples around ! If it is really colorful , why is that ?

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    Re: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

    There are several possible reasons. My amateur suggestion; It may be that the emulsion is "mirroring" due to deterioration, from improper processing and/or storage.
    This is often seen in prints, and I've seen it in nitrate negatives. But I don't know if glass-plate negatives are affected that way.

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    Re: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

    Quote Originally Posted by Mark Sampson View Post
    There are several possible reasons. My amateur suggestion; It may be that the emulsion is "mirroring" due to deterioration, from improper processing and/or storage.
    This is often seen in prints, and I've seen it in nitrate negatives. But I don't know if glass-plate negatives are affected that way.
    Mark , What do you mean with mirroring ? Is it a scientific term ? Thanks.

    Umut

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    Re: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

    Let me consult with my wife; she is a photograph conservator and will help with identification.
    In the meantime, let's hope someone already informed will explain.

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    Re: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

    I see color but I think it is coming from the window they are holding the neg up in front of. Look below to the left of the glass plate, you can clearly see blue sky and buildings reflected on the table top.

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    Re: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

    there might be colors because it was taken with a modern digital camera and the world outside and inside where the person is holding the plate has colors reflecting on the glass. I scan black and white materials all the time and the scanner picks up on color in the emulsion too.. so it might be that as well.

  7. #7

    Re: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

    A friend of mine worked for the USGS. He started in the sixty's when the USGS was in Washington DC. He found the plates in the basement and they were wrapped in newspaper. It was at the time the USGS was moving out to Reston VA and they were going to trash the plates. He worked with some else and they saved the plates.

    So the problem could be from bad storage conditions in the basement or bad processing in the field.
    Richard T Ritter
    www.lg4mat.net

  8. #8
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    Re: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

    I scan BW film & plate with V700 in color

    Yes color from computer

    Which I like

    But not good for OP

    Set your DIGI to BW

    Quote Originally Posted by jnantz View Post
    there might be colors because it was taken with a modern digital camera and the world outside and inside where the person is holding the plate has colors reflecting on the glass. I scan black and white materials all the time and the scanner picks up on color in the emulsion too.. so it might be that as well.
    Tin Can

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    Re: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

    OP what is the article ? does it say where the negative lives? you might get a definitive answer asking the person who curates HWJ's plates.

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    Re: Henry William Jackson glass negative from NGM 1989/2 , Is it colorful ?

    dichroic or dichroism: "Glass or crystals showing different colors when viewed from different directions, or having different absorption coefficients for light polarized in different directions" Many years ago used this extensively in Photomicrography of prepared specimen slides.

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