Fig. 3From: Change is permanent: thoughts on the fading of cochineal-based watercolor pigmentsGraphs of ΔE versus exposure time to light aging in a weatherometer. Arbitrary lines are drawn to aid visualizing the changes. a Three complexes on alkaline paper. b Three complexes on neutral paper. c Three complexes on acidic paper. d CA-Sn lake on three papers. e CA-Al lake on three papers. f Uncomplexed carmine, CA, on three papersBack to article page