Table 1 Varnish removal methods optimised for the brown earth oil paint sample
Cleaning system | Delivery method | Preparation and application | Exposure time (min) | Removal and clearance |
|---|---|---|---|---|
Surfactant-containing OiW microemulsion (Polar Coating B from Nanorestore Cleaning) | HWR | Gel immersed in diH2O for 24 h, before pre-loading with Polar Coating B (immersion, 12 h). Gel cut to 2 × 2 cm. Gel blotted on each side for one second on Whatman Grade 1 paper, before placing on surface with tweezers. Contact increased by momentarily pressing gel with tweezers. System covered with polyester film (Melinex) | 4 | Gel removed with tweezers, followed by dry cotton swab rolling, and then wet cotton swab rolling (diH2O) |
Surfactant-free OiW microemulsion (65/25/10 wt.% diH2O/2-propanol/1-butanol) | Evolon | Cloth cut out to 2 × 2 cm. Dry cloth placed on surface with tweezers with thread direction parallel to brushstrokes, before applying 8 drops of the cleaning system to the cloth using a pipette as illustrated below, Contact increased by momentarily pressing cloth with a dry brush | 2 | Cloth lifted with brush, followed by dry cotton swab rolling |
