BIODETERIORATION Deterioration is defined as a loss of structural capacity with time as a result of the action of the external agents or material leaching. Biodeterioration is the chemical or physical alteration of a product that decreases its usefulness for its intended purpose, caused by micro or macroorganisms or their enzymes. In 1965, Hueck defined Biodeterioration as “Any undesirable change in the properties of a material caused by the vital activities of organisms”. This is the widely accepted definition for Biodeterioration. In 1981, Rose defined Biodeterioration as “The process by which Biological agents are the cause of the lowering of quality or value”. Biological deterioration caused by Insect attack and Fungal growth and the other form of Deterioration is caused by adverse environmental conditions such as extremes of dampness or wide fluctuations in relative humidity associated with large variations in day and night temperatures, light and atmospheric pollutants. Both Biod...