Pattern on the sidewalK
Dying leaf leaves dye
Today while I was out walking, I happened to notice some leaf imprints on a large area of the concrete sidewalk here where I live. I had never seen this before so of course I took a picture and then researched it online to see the cause. I found that when leaves fall onto concrete and lay there decaying they excrete a dye called tannin that stains the concrete and so leaves their image when they are removed. The dye stains can be removed by detergent and scrubbing. I found this to be quite interesting!
Leaf Prints-The Urban Naturalist
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