New Strategy for the Cleaning of Paper Artworks: A Smart Combination of Gels and Biosensors

Table 1

pH values before and after cleaning treatments [9].

	Before	After  (cleaning step with gel)	After  (traditional clearing step)
XVI	8.5 ± 0.1	9.4 ± 0.2	9.3 ± 0.1
XVII	7.1 ± 0.2	7.6 ± 0.1	7.9 ± 0.2
XVIII	8.6 ± 0.2	9.0 ± 0.2	8.9 ± 0.2
XIX	5.1 ± 0.1	6.4 ± 0.1	5.9 ± 0.1