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Heritage Science
Fig. 2 | Heritage Science

Fig. 2

From: Temperature- and humidity-induced changes in alum-treated wood: a qualitative X-ray diffraction study

Fig. 2

XRD pattern of powder sample from fragment 185-5 (refined lattice constant for potassium alum, a = 12.16561(3), space group Pa-3) and patterns taken 2 months and 2 years after mild heating, showing conversion of alum to an amorphous phase (98% increase in amorphous contribution), which remains after 2 months. After 2 years crystalline alum peaks have reformed, accompanied by peaks from dehydrated form KAl(SO4)2·6H2O (marked with inverted triangles)

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