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

Heritage Science

Table 3 Mock-up sets and exposure procedure

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