Environmental Engineering Reference
In-Depth Information
Figure 11.10.
Relief in Navrongo cathedral representing a cow with
engraving in the background (CRATerre 1999)
Few studies have been performed on the use of traditional decoration techniques,
methods, and raw materials in Africa [PIB 00, RAI 92]. Shekede [SHE 00] applied
analytical techniques to characterize wall paintings made out of earthen material.
Our Lady of seven sorrows cathedral in Navrongo is an exceptional showcase for
these types of decorations. Traditionally, a primary layer of thin earth and cow dung
is applied. The relief is molded into the thickness of the layer. After this has half
dried, red paint mixed with gluey leaves is applied over the entire surface (see
Figure 11.17). Drawings are made with black earth powder mixed with gluey leaves.
These drawings delineate the future colors. Finally the colors, mixed in leaf juice,
are applied to the surface and give life to the entire relief. Relief and drawings can
be amplified by engraving the surface. The red comes from pulverized pebbles and
the white from a white stone. When the colors are dried, a varnish (dawa-dawa)
composed of leaf juice and pieces of trees is spread on the surface.
Figure 11.11.
Red earthen paint applied to all of the reliefs (CRATerre 1999)
