PLM2 starch particle with lake XPL 400x.jpg

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Photomicrograph of wheat starch grain used as a red lake base, XPL at 400X. Note low birefringence with first-order grays and extinction cross. Examined with a Nikon NiU upright polarizing light microscope, image captured with DSRi1 Pixel-shifting camera and Nikon Elements Basic Research software. Colonial Williamsburg Foundation, Materials Analysis Laboratory.

Sample from object CWF1950-593, Tooth cleaning powder in oval paper box, French, c.1750-1830

Photo credit: Kirsten Moffitt, Colonial Williamsburg Foundation

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