Table 3 The linear hygroscopic expansion coefficient of paints and dried yolk measured in the study and calculated for their components
From: Mechanical and moisture-related properties of selected dried tempera paints
RH range | 30–40% | 70–90% | ||
Linear hygroscopic expansion coefficient | αRH,paint [10−5 per 1% RH] | αRH,binder [10−4 per 1% RH] | αRH,protein [10−4 per 1% RH] | αRH, paint /binder [10−5 per 1% RH] |
Dried egg yolk | 1.6 (measured) | 4.9 | 79 | |
Egg tempera | ||||
Yellow ochre | 1.0 (0.85a) | 0.9 | 2.8 | 2.8 |
Azurite | 1.0 | 1.3 | 3.9 | 2.4 |
Hydrocerussite | 1.3 | 1.0 | 3.1 | 3.4 |
Cerussite | 1.0 | 0.7 | 2.2 | 1.9 |
Distemper | ||||
Azurite | 1.6 | 4.6 | 4.6 | 4.1 |