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A comparative study between vegetable and chrome tanned leather artifacts to explain the extent of resistance of chromium toxicity against the microbiological deterioration and biodegradation of chrome

Author: 
Elsayda-Nafesa El-Shamy
Subject Area: 
Social Sciences and Humanities
Abstract: 

There are huge and Historic collections in museums archives and libraries are basically made of organic materials that are hygroscopic and sensitive to bio-deterioration processes. Often, collections are located in historical buildings that maintain micro environments appropriated for the development of microorganisms on their objects including proteins objects and leather artifacts. Collagen in tanned leather is more resistant to mold growth than in untanned leather. Unfortunately, historical manuscripts covers are vegetable tanned leathers, but chrome leathers being used primarily in leather artifacts like shoes, luggage and other such items. Both kinds of them exposed to microorganism deterioration resulted in different aspects of deterioration. This study aims to compare between the chromium and vegetable tanned leathers in resistant against microbiological deterioration and explain how chrome-tanned leathers are more resistant than vegetable-tanned leathers according to chrome toxicity, and test this resistant by measuring the mechanical properties (tensile strength – elongation) of the new tanned samples treated with the microbiological accelerated ageing cycle by identified microorganisms at different conditions. Also explain the biological degradation of chrome and how the microorganism degradation occurred through a survey of the previous studies of most common microorganisms that infected the historical vegetable/chrome tanned leathers in museums.

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