Munchs Paintings in the Aula of Oslo University

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Munchs Paintings in the Aula of Oslo University

• (1909-1916)

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Project Outline

• First Phase monitor humidity, temperature,
  airborne pollutants and soiling characteristics
• Second Phase examination of technique and
  condition, documentation
• Third Phase removal of one of the paintings to
  evaluate feasibility of remounting
• Fourth Phase submit proposals for adjustments of
  building, treatment of paintings
• Fifth Phase implementation of accepted proposals
  (cleaning)

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Soiling characteristics
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Particle Size
Microns
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Particles within the 0.1 to 2 micron range
Investigation will focus on this range of
particle size because

• The black tar-like particles from high
  temperature combustion fall into this category.
• This range also includes sulphur dioxide and
  oxides of nitrogen together with ammonia.
• This is the largest group of particulates which
  absorb pollutant gasses and vapours they are
  therefore the highest risk group.

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Possible mechanisms for dirt deposition

• Themophoresis
• Moisture differentials

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Thermophoresis
Thermophoresis Particle motion in a temperature
gradient, from a hotter to a colder region
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Reasons for Thermophoresis

• The fibre board backing acts as thermal
  insulation.
• Air flow/ cold bridging due to joints in back
  board cause temperature differential across the
  surface of the painting.
• Differential surface temperature results in
  differential dirt deposition

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Heat source
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Moisture differentials

• Moisture transference from the verso via joints.
• Higher moisture content stickier surface

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Sources of particualte pollution
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Proposed monitoring

• Thermohydrographic measurement
• Real time dust deposition (reflectance)
• Environmental surface monitoring (Geletin
  lifters)
• Thermal imaging
• Colorimetric measurement of test samples