Fig. 13From: The origins of the Selden map of China: scientific analysis of the painting materials and techniques using a holistic approach a Colour image derived from the spectral image cube of ‘Area 19’ on the Selden map in Fig. 1 near the Great Wall; b 450 nm image of the region showing alterations made to the wall; c near infrared 880 nm image of the same regionBack to article page