In this panel the underdrawing is made of charcoal (letter "A") and sanguigna (letter "C").

Each pigment is presented in mixture with two binders: Arabic gum (column on the left) and egg tempera (column on the right).

The painted surface is divided into 3 stripes: the first 2 present 2 different finishings: terpene resin (stripe on the top) and acrylic resin (middle stripe). The third one is unprotected.