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Figure 3
Optical micrographs of eighteenth-century Prussian blues that were not treated with hydrochloric acid and that contain alumina hydrate: (a) D3 and (b) D2. The micrographs have been obtained with reflected visible light and dark-field illumination. The orange particles contain ferri­hydrite.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
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