Fig. 5
a Electron micrograph with EDX microanalysis of a parchment sample marked with LIGG ink after artificial ageing at 32 days (T = 80 °C, RH = 80 %). Dotted line indicates ink region (left) and parchment region (right). At both regions, CaSO4 crystals are recognizable in varying sizes and quantities; original magnification ×500. b Magnified electron micrograph with EDX microanalysis of salt crystal in a LIGG ink region of parchment sample marked with ink after accelerated ageing at 32 days (T = 80 °C, RH = 80 %); original magnification ×2000. c Elemental EDX microanalysis spectrum of area in yellow frame in 4 (b)