Fig. 1From: Studies on the effects of mixed light-thermal ageing on parchment by vibrational spectroscopy and micro hot table methodFTIR-ATR spectra of PUV1 (grain side) and PUV2 (corium side) parchment samples exposed to artificial ageing for a maximum of 748 h. Amide I and Amide II appear shifted and with progressively lower absorption intensity. Amide III shows progressively lower absorption intensity as well. The shoulder-type band at 1740 cm−1 occurs after 12 h of artificial ageingBack to article page