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Continue to ChatColor printing by Jean Robert, assistant to J. C. Le Blon https://graphicarts.princeton.edu/2018/08/29/color-printing-by-jean-robert-assistant-to-j-c-le-blon/
Color printing by Jean Robert, assistant to J. C. Le Blon https://graphicarts.princeton.edu/2018/08/29/color-printing-by-jean-robert-assistant-to-j-c-le-blon/