Conservation Science for the Cultural Heritage by Evangelia A. Varella

Author:Evangelia A. Varella
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

Thermal analysis has been used to analyse a number of terracotta materials [143] from different periods and yielded information not only about their composition but, at least in the first instance, also concerning the different levels of technical ability attained by the craftsmen. The terracotta material is characterised by significant differences between the upper and the lower parts, particularly as far as the calcite content is concerned, which is substantially different in the upper and lower parts of several of these statues. This indicates a substantial lack of homogeneity in these artefacts. The equivalent firing temperature is different, which would seem to indicate that the kiln operators experienced some difficulty in maintaining an even temperature throughout the kiln.

The results of thermoanalysis have been discussed in terms of the original assembly and firing of the archaeological finds [144] and their subsequent restoration. Several parts of the fictile statue were made in separate moulds and then assembled to form a single complex before firing. The firing temperature does not seem to have been completely uniform—in particular, the base seems to have reached a higher temperature than the upper parts of the statues (Fig. 4.34).

Fig. 4.34TG/DTG-DTA curves of raw clay brick fired at 500 °C [145]

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