A paper just published in Studies in Conservation by Kim Bell and Robin Canham of Queen's University Library, Canada, has analysed the card mounts of stereocards, based on a limited sample of North American cards recently donated to the library. Their analysis by X-ray fluorescence (XRF) spectroscopy has indicated the significant presence of different heavy metals in the mounts, reflecting the chemistry used to colour them. This should not be a particular surprise as Victorian wallpapers, book cloths, papers and textiles have long been recognised as problematic. Bell and Canham's research is the first time XRF has been applied to stereograph card mounts.
It is worth quoting part of their conclusion: While this is an initial study, this research identified the significant presence of potentially harmful heavy metals, specifically arsenic-, lead-, and chromium- based pigments on nineteenth century stereograph cards and highlights the pervasive use of toxic substances in Victorian-era consumer goods. These findings extend our understanding of the historical usage of toxic pigments beyond popular previously recognized mediums such as wallpapers, textiles, and books, and demonstrates the prevalence of health hazards in historical collections. and, they add, it is imperative that GLAM [galleries, libraries, archives, and museums] workers know the inherent risks present in their collection materials to protect themselves and their communities.
Although Bell and Canham do not make any assessment of the direct risk to individuals by handling cards, by being in proximity with stereograph card mounts, or the risk through inhalation or ingestion, this new knowledge should act as a prompt for collections to update their risk registers, and ensure that staff and visitors are properly attired, made aware of the risk, and any risk is mitigated.
Toxicity in 3D: XRF Analysis for the Presence of Heavy Metals in a Historical Stereograph Collection at Queen’s University Library, Canada
Kim Bell and robin Canham
Studies in Conservation, published online, open access
Taylor and Francis, 14 January 2025
See: https://www.tandfonline.com/doi/full/10.1080/00393630.2025.2450976
Image: The desktop setup of the Bruker III-SD pXRF with sample stage accessory on top. The stereograph card was placed on top of the sample stage with the edge of the card just covering the examination window. A sheet of Mylar® polyester film was placed on top of the stereograph to prevent abrasion. The accessory shield was placed on top of the film. Photo credit: Robin Canham.
With thanks to Rebecca Sharpe for drawing attention to the paper.
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