Figure 1.

The prepared samples procedure: (a) the support layer consisting of linen or a mixed mud and sawdust; (b) the white preparation layer consisting of a calcium carbonate-covered support layer; (c) the applied paint layer above a layer of calcium carbonate; (d) the white finishing layer of calcium carbonate; (e) the addition of stains such as clay (mud), rosin resin, color, and dust; (f) the placement of samples in a thermal oven at a temperature of 80 ± 2 °C; and (g) the samples exposed to ultraviolet radiation for 48 h using fluorescent bulbs.