Helping museums protect artwork:
Assessing the vulnerability of artwork using a portable microfade spectrometer
Overview

Museums struggle to balance the need to protect light-sensitive artwork with the desire to give visitors the best experience possible. One way of dealing with this conflict is to rotate the objects between display and storage. Microfade testing was developed in the 1990s to help better determine appropriate exhibition lighting conditions.

This process for efficiently detecting extremely light-sensitive materials on objects in situ involves focusing an intense beam of light on a tiny area less than a millimetre across. By varying the intensity of the light and monitoring the colour change over time, the fading rate of the material can be rapidly determined without causing noticeable damage to the object.

The first generation of systems were bulky and manually operated. NTU has now developed portable automated microfade spectrometers capable of high-precision fading measurements. There is considerable interest from the museum community in applying microfade spectrometry to objectively judge the light sensitivity of the items in their collections. It is believed that using the equipment for accelerated light ageing tests can save museums over £1 million a year.

Imaging and Sensing for Archaeology, Art History and Conservation (ISAAC) performing Microfade Spectrometry

In-house built microfade spectrometer

Addressing the Challenge

The Tate funded a PhD student project at Nottingham Trent University, based within the ISAAC Research Centre, to develop a microfade tester to measure the light sensitivity of watercolour paintings and help design the optimum exhibition conditions. A follow-on project with Higher Education Innovation Funding (HEIF) allowed the ISAAC Research Centre to develop a robust portable microfade spectrometer. This automated system is easy to transport and assemble, suitable for taking into museums for in situ testing.

Making a Difference
People

Academic Investigator:

Professor Haida Liang (Nottingham Trent University)

Research Fellow:

Dr Chi Shing Cheung (Nottingham Trent University)