Fig. 3From: Non-invasive imaging and spectroscopy techniques for identifying historical pigments: a case study of Iranian manuscripts from the Qajar eraa µ-XRF spectrum of golden parts; b Raman spectrum of green corrosion products of golden parts and, c the 1200–1750 cm−1 range of this spectrum after baseline correction, along with its second derivative, which indicates the metal carboxylates index band at 1465 cm−1Back to article page