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
Deposits: Thick and hard white (brownish) deposit on most of the
pieces, possibly from distemper or
These deposits often conceal the corrosion of the glass.