Munch s paintings in the aula of oslo university
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Munch’s Paintings in the Aula of Oslo University

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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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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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Moisture differentials

  • Moisture transference from the verso via joints.

  • Higher moisture content = stickier surface



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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


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