Fig. 9From: Evolution of the viscoelastic properties of painting stratigraphies: a moisture weathering and nanoindentation approachEvolution upon relative humidity variations of the storage modulus of the madder applied on the surface and covered layer, measured by indentation DMA at \(f_1\) = 1 Hz at the penetration depth of 2 \(\upmu\)m (with lines as guide to the eye)Back to article page