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Heritage Science
Fig. 2 | Heritage Science

Fig. 2

From: Creation and reference characterization of Edo period Japanese woodblock printing ink colorant samples using multimodal imaging and reflectance spectroscopy

Fig. 2

Safflower extraction process. Clockwise from top left: a rinsing safflower to remove yellow colorant b until clear; c vacuum filtration of safflower soaked in deionized water adjusted to pH 11 with ammonium hydroxide; d adjusting the pH of the filtered extracted with acetic acid; e absorbing the concentrated acidic dye extract in cheesecloth; f concentrated dye extract in cheesecloth when dry—the intensity of the color decreases with successive dips; g extracting the dye with deionized water adjusted to pH 12 with ammonium hydroxide before mixing with the binder for printing

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