The effect of Preparation layers on the Anatomical Structure and Chemical Composition of Native Egyptian Wood

Citation:
El Hadidi, N. M. N., and S. A. M. Hamed, "The effect of Preparation layers on the Anatomical Structure and Chemical Composition of Native Egyptian Wood", First Vatican Coffin Conference, Vatican Museums Conference Halls, 22 June 2013 , 2017.

Date Presented:

22 June 2013

Abstract:

The effect of the chemical reaction between preparation layers and wood was studied using scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR). The changes in the anatomical structure and chemical composition in three native Egyptian hardwood types; Ficus sycomorus, Acacia sp., Tamarix sp.; due to the chemical effect of six preparation layers with different components commonly employed in the past to cover the wood surface were characterized and identified. The results obtained from both the SEM and FTIR techniques were almost compatible. The decay patterns of chemical attack in the three types of wood depended on the percentage of lignin and carbohydrates within each type, but the components of the preparation layers caused similar structural and chemical changes according to the acidity or alkalinity of the layer. The results showed that calcium carbonate (chalk) affected and degraded lignin more readily than carbohydrates due to its alkalinity, whereas gypsum, which is acidic, tended to degrade carbohydrates more aggressively than lignin. When the two minerals are used together in the preparation layer this leads to severe degradation in wood structure resulting in embrittlement and loss of wood integrity in the wood surface that lay directly beneath the preparation layer.

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