Fig. 11From: Materials and techniques of Islamic manuscriptsa–c Comparison of visible (a), infrared (b) and ultraviolet (c) images from a 16th century folio altered in India in the 17th century (Table 1, #35). The effect of darkening can be seen in the top left where the river is clear in the infrared image but obscured in the visible image. The yellow florescence in ultraviolet light is characteristic of Indian yellowBack to article page