Fig. 7From: The identification, approaches to cleaning and removal of a lead-rich salt crust from the surface of an 18th century oil paintingPhotomicrographs before and after cleaning with EDTA solution and gel at pH 7.5; A, C, and E areas before cleaning; B After cleaning with EDTA solution; D After cleaning with gelled EDTA at 30 s; F After cleaning with gelled EDTA at 60 sBack to article page