Copper 銅(do): Flakes or powdered metallics are often found in deluxe editions and surimono prints. Animal glue would probably have been used to adhere the flakes or as a binder in printing.
Not found often.
For more information see: Copper
Examples of Copper in Ukiyo-e Prints
Analysis
X-ray fluorescence analysis (XRF) is used to detect copper.
XRF spectrum for vermilion
Other Images of Copper
List of Prints
List of prints where indigo was detected
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