Fig. 2From: Powdered cellulose microblasting: a useful technique for dry-cleaning the reverse side of canvas paintingsChanges in L*(D65) and b*(D65) after cleaning the old canvas. The various shades of grey range from more luminosity (lighter grey) to less luminosity (darker grey) in the first graph and from less yellow (light grey) to more yellow (dark grey) in the secondBack to article page