Figure 4From: A study on the painting techniques and materials of the murals in the Five Northern Provinces’ Assembly Hall, Ziyang, ChinaMicrographs of the fibres in plaster. Optical micrograph (a) and scanning electron micrograph (c) of rice straw in the coarse layer. Optical micrograph (b) and scanning electron micrograph (d) of fresh rice straw. Scanning electron micrographs (e,f) of cotton fibre from the fine layer.Back to article page