Lightfastness Assessments

Microfading testing (MFT) represented an advance over previous lightfastness assessments, which relied on the evaluation of representative mock-up samples or direct monitoring of object color change during display. The use of mock-up samples is hindered by time-consuming chemical analysis of the colorant system and sample preparation that may not reflect the chemical and physical nature of the object. While color monitoring of objects provides a direct assessment, this requires the object to first undergo an overall color change, followed by the laborious process of continually repositioning the spectrophotometer on the same test areas.

Access to MFT-generated data on object-specific light sensitivity before exhibition and its comparison to standard reference material provides valuable context for selecting objects and defining lighting needs. More broadly, this information has the potential to shift interdepartmental collaborations between collection staff–conservators, collection managers, curators, registrars–from an “us versus them” relationship to one focused on risk management and facilitating greater access where possible.