Iridescence along the River 6
August 5, 2018
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This entry was posted on August 5, 2018 by Linda Grashoff. It was filed under Iron Oxide and was tagged with biofilm, iridescence, leaf, Leptothrix discophora, nature, photography, Vermilion River.
Romancing Reality 
I especially like this one, with the contrast of textures…smooth, wet stone, and glowing water.
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August 5, 2018 at 10:12 AM
Thank you, Clare. It’s often hard to find a good composition with the biofilm. But the rocks and precipitated iron oxide and leaf helped out in this case. I have so many more photos of this stuff that I will never show on the blog, but I can’t resist taking them just because they’re there.
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August 5, 2018 at 11:57 AM
Do you ever examine the film microscopically?
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August 5, 2018 at 8:50 PM
I have not, George, though I’d bet my husband could sneak me into a lab where that would be possible. My mentor, Norrie Robbins, has examined the iron bacteria under a microscope. See her website: https://pubs.usgs.gov/gip/microbes/table.html.
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August 6, 2018 at 1:10 PM
I like the complimentary curves of the leaf and rock edge in this one. I think you can get another image from this, zooming in tighter, with the most colorful part of the bacteria, the leaf & part of the rock. At the same time, it’s nice to have context, which this view has, with the other bits of rock and mud.
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August 11, 2018 at 11:36 AM
I checked this photograph for a possible tight crop, and unfortunately, it didn’t pass the test. The film is too broken up. So I guess all you get with this one is context. I didn’t notice the complementary curves; thanks for that observation!
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August 11, 2018 at 2:36 PM