PLM5 twinning in gypsum particle PPL 200x.jpg
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Photomicrograph of a sample of gypsum mixed with wheat starch grains stained with an organic red dye. Note the twinning observed in the central gypsum particle. Gypsum was confirmed with FTIR-ATR analysis (Colonial Williamsburg Foundation). Transmitted XPL, 200X. 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.
This sample was collected from an object in the Colonial Williamsburg Collection: CWF1950-593, Oval Box with Tooth Cleaning Powder, French, 1750-1830
Photo credit: Kirsten Moffitt, Colonial Williamsburg Foundation
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:03, 27 September 2017 | | 875 × 700 (446 KB) | KMoffitt (talk | contribs) | File uploaded with MsUpload |
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