ALTARPIECE OF OUR LADY OF BETHLEHEM

SCIENTIFIC ANALYSES 

In the course of the restoration work that is currently underway (2013-2014), the following scientific analyses are being carried out:

- Computerised Axial Tomography (TAC)

- The dendrochronological study of the oak panels and beams

- The chemical analysis of the different layers of polychrome decoration, the main results of which are:

Very thinly-applied white chalk preparation coat with animal glue.

Gilt on translucent light brownish-orange mordant with white lead, minium and soil in linseed oil with a small percentage of diterpene resin.

Flesh tones based on white lead, vermillion and calcite in linseed oil.

Applied brocades with wax and conifer resin fillings.

Azurite applied to a black background of vegetable charcoal.

Greens made from verdigris and cupric resinate.

*Data provided by Ms. Laura Ceballos at the Spanish Institute for Cultural Heritage.