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Heritage Science
Fig. 9 | Heritage Science

Fig. 9

From: Preliminary photographs and improved positives: discovering the New York Public Library’s Arctic Exploration album

Fig. 9

a Normal light photograph of plate 48 (improved positive), with indication of sampling site. b Photomicrograph of sample S3, i.e. a scraping of purple paint from the sky, taken in reflected light using fiber optics illumination under a stereomicroscope. c BSE image of sample S3, with indication of the area mapped with EDS. d X-ray elemental maps of zinc (Zn), calcium (Ca), phosphorus (P), iron (Fe), aluminum (Al), and silicon (Si) collected from a portion of sample S3

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