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Table 3 Mock-up sets and exposure procedure

From: Evaluation of novel cleaning systems on mock-ups of unvarnished oil paint and chalk-glue ground within the Munch Aula Paintings Project

Mock-up set 1 (M1) Mock-up set 2 (M2)
Composition
Type 1. Stretched linen canvas, glue size, chalk-glue ground (G)  
Type 2. Type 1 + undiluted cobalt blue oil paint (Pu)
Type 3. Type 1 + turpentine diluted cobalt blue oil paint (Pd)
Exposure sequence
Natural ageing: c. 28 weeks Natural ageing: c. 21 weeks
Artificial soiling: 40 applications Artificial ageing c. 2–3 weeks
45 °C (BST), 30 °C (CHT), 65% RH, 50 W/m2
Artificial ageing: c. 1 week
45 °C (BST), 30 °C (CHT), 65% RH, 50 W/m2
Artificial soiling: 40 applications
Natural ageing c. 18 weeks Artificial ageing: c. 1 week
45 °C (BST), 30 °C (CHT), 65% RH, 50 W/m2
Artificial soiling: 20 applications Natural ageing: c. 16 weeks
 
  ‘Pre’ cleaning with soft bread
 
  Artificial soiling: 20 applications
 
  Artificial ageing 1 week
45 °C (BST), 30 °C (CHT), 65% RH, 30 W/m2
 
  Artificial soiling: 20 applications
Total
Artificial ageing: c. 1 week
Light energy dosage for samples: 30,719 kJ/m2
Artificial ageing: 4–5 weeks
Light energy dosage for chalk-glue ground mock-ups: 143,349 kJ/m2
Light energy dosage for oil paint mock-ups: 159,521 kJ/m2