Fig. 14From: Materials and techniques of Islamic manuscriptsRaman spectra of blue used for the blue braid of the glass vessel (a) and the blue animal on the ceramic vessel (c) on an 18th century Iranian folio (Table 1, #38), compared to the reference spectra for azurite (b) and ultramarine (d). All reference spectra from RRUFF database http://rruff.info/Back to article page