FAH483H1 Lecture Notes - Lecture 2: Color Vision, Logarithmic Scale, Sulfite

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23 Mar 2018
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FAH483: Introduction to Conservation
Lecture 2 January 11th
Agents of Deterioration
Causes of deterioration of cultural materials
-Organic: derive from living materials
-Undergoes carbon life cycle
-Organic materials of processed or altered to create cultural artifacts
-Inorganic: are not living derived substances
-Stone
-Glass
-Metal
-All materials change in chemical and physical properties over time
-Metal Ore:
-Smelting to achieve a material that can be worked with
corrosion (: a greenish sulphite metal trying to convert back to
metal ore)
-Carbon Cycle
-organic materials also decay and break down to weathering and micro
organisms
Deterioration Factors
-Light, humidity, temperature, dust/pollutants, natural
disasters/physical forces, human factors, and pests
Deterioration of Materials
-Physical/ mechanical damage
-Chemical alteration
-Most deterioration will be visible, unless chemical
-Shattering, cracking caused by impact-possible loss structural failing:
metal fatigue tear in paper
Chemical Alteration: may or not be easily visible
-Breaking chemical linkage= weakness
-Change in chemical structure can lead to change in color
Effects of Deterioration
-Deterioration of one object can effect another, can also affect the
value of an object
-Oxidation: chemical reaction with oxygen
-Hydrolysis: reaction with water or water vapour
-causing weakening in base material by breaking molecules
into shorter chains
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