Fig. 7From: Factorial experimentation on photodegradation of historical paper by polychromatic visible radiationa Contour plot of ΔE00 of historical paper exploring the effects of [O2] and t at 50% RH and 50 lx. b Contour plot of ΔE00 of historical paper exploring the effects of Ev (lx) and t at 50% RH and 21% [O2]. Each contour line represents a step of 0.1 ΔE00Back to article page