panel 13, condition of internal surface

Glass: seem to be less deteriorated in the internal face. It is possible to see hole alterations dispersed over the surface of the glass.

Paint: ancient painting with thick line and wash-drawing. Brown-red painting (warm brown)

Lead: good condition

Putty: dry and waterproof

Coating: none

Deposits: Thick and hard white (brownish) deposit on most of the
pieces, possibly from distemper or
mastic residue.

These deposits often conceal the corrosion of the glass.