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Exploring Damage Dose Relations Using Metal Sensors: Effects of Pollutants on Artifacts

This study investigates the relationship between pollutant exposure and metal damage in museum artifacts using metal sensors. We focus on corrosive atmospheres produced by various pollutants like SO2, NOx, and organic acids that can significantly affect the integrity of metals like copper and silver. Through electrochemical analysis and short-term measurements, we assess the impact of these environmental factors on artifact preservation. The findings highlight the need for improved ventilation strategies and pollutant control methods to mitigate damage and ensure the longevity of cultural heritage collections.

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Exploring Damage Dose Relations Using Metal Sensors: Effects of Pollutants on Artifacts

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  1. Looking for damage dose relations using metal sensors Bart Ankersmit Simon Watts Virginia Costa

  2. INTRODUCTION Pollutant Metal Amount / Composition / Time ?

  3. CORROSIVE ATMOSPHERES • Mimmic museum atmosphere: • SO2 / NOx / O3 • Organic acids (HAc / Formic Acid) / Formaldehyde • Sulfides (H2S / OCS) • Concentrations: • Background levels • 10x higher (museum event) • 10x higher (lab concentrations)

  4. Cu & Ag Tokens Composition of surface Onguard f (t, pollutants) Mass increase

  5. Short term measurement Non-specific ‘natural aging’ Dutch archival law Present in some museums 12 provincial archives

  6. Piezo Electric Crystal Frequency (Hz) Accept / not acceptable Å (t) ?

  7. oven - H2S - SCO - HAc - HAc / FAc

  8. Purafil: Extremely pure air Data against “background” air (22 oC / 50%)

  9. SCO: copper more reactive than silver HAc + FAc: copper 2 reaction products ELECTRO CHEMICAL ANALYSIS OF COUPONS

  10. Why? What can be done? Silver tarnishing

  11. Deployment QMB Ventilation + Recirculation Recirculation

  12. V+RC = 74 Å/yr Silver yellow in 2 years RC = 32 Å/yr Silver yellow in 5 years

  13. CONCLUSIONS [Pollutants]  reaction products f  [Pollutants] is unclear QMB is not behaving the same way as the tokens Hanging issues

  14. Open issues Uneven tarnishing / corrosion? Fequency drift? Δf ↔ ΔM ↔ degradation of mixed collection

  15. RH / T effect on frequency?

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