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Table 5 Global colour changes calculated between the not treated surface and after coating application (NT-P), and between the not treated surface and after ageing and cleaning of the coating (NT-PAC)

From: Mi Fuma il Cervello” self-portrait series of Alighiero Boetti: evaluation of a conservation and maintenance strategy based on sacrificial coatings

   ∆E
NT-P NT-PAC
Talken A 2.9 4.7
Dupli color B 2.9 14.8
Saratoga C 2.2 5.5