I have noticed a strange effect on some of the photograph sleeves currently housing photos in our archives. The sleeves are clear, maybe polyester. And some of them have what looks to be moisture inside the sleeve. The "moisture" has a swirly rainbow look, like you might see if you spilt oil on pavement on a sunny day. At first I thought it was moisture trapped in the sleeve, but now I'm wondering if the effect is just part of the material. Do any of you know what this could be?
Thanks!
Ashley
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