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Table 2 Results of FTIR-ATR analysis for the samples exposed to artificial ageing for a maximum of 748 h: PUV1 (exposed on grain side) and PUV2 (exposed on corium side)

From: Studies on the effects of mixed light-thermal ageing on parchment by vibrational spectroscopy and micro hot table method

Exposure time (hours)νAI (cm−1)νAII (cm−1)Δν(AI–AII)I(AI)I(AII)I(AIII)a(AI)
PUV1 (grain side)
 016351552830.270.2060.093144.97
 1216351552830.320.2380.073149.40
 8316351546890.090.0660.057157.96
 24816401546940.250.1950.082169.64
 39216401541990.140.1030.057175.83
 748164615301160.090.0680.040185.81
PUV2 (corium side)
 016351552830.3130.2270.089142.86
 1216351549860.3300.2350.079148.87
 8316401544960.2700.1820.071156.60
 248164015401000.2440.1730.09168.17
 392164515361090.2280.1520.076169.96
 748164815321160.1600.1100.063180.41
  1. The wavenumber values of Amide I (νAI) and Amide II (νAII), the cumulative peak shift of Amide I and Amide II (Δν), the intensity of Amide I, II and III bands (I(AI), I(AII), I(AIII)), as well as the area of the Amide I peak (a(AI)) are listed for each mock-up at selected times