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Glass scratches

Scratch on a glass or plastic microscope slide, with a row of bristles on either side. The bristles are angled toward the left in the image, suggesting the direction of etching.  Was it from left to right or the reverse?.
Photograph by Kerry Patterson, water microbiology lab at the Rhode Island State Health Labs, Providence, Rhode Island USA 28 July 2015.

Scratch on organic surface evaporite of phenanthroline monohydrate
Photograph in polarized light by Ray Dessy (2008) posted online

Dessy, R. Birefringent organic crystals – Butterflies on glass 2008. Micscape.

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