Solving Historical Mysteries with ENVI Spectral Analysis Spectral analysis is usually thought of in relation to remote sensing data, but the Library of Congress Preservation Research and Testing Division (PRTD) has developed an application of hyperspectral imaging to analyze and preserve cultural heritage materials. “We knew ENVI was an incredibly powerful piece of software for extracting information from satellite and aerial imagery,” said Fenella France, chief of the PRTD. “We were interested in seeing what else it could do.” Working primarily in ENVI, France and her team adapted spectral imaging tools to create noninvasive, nondestructive analytical techniques. “We’ve been able to identify and characterize colorants, inks, and paper or parchment; monitor deterioration or changes d

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