Table 1 Tested rooms with their corresponding history of mould growth

Long Gallery

At the rear of book stacks on, leather and vellum book bindings, and at the sides of the fireplace

Upper Ante-Room

Behind the tapestries and at the rear of the book presses

Peter the Great

On the silken wall cover and behind the picture frames

State Bedroom

Under the bed

Brown Drawing Room

Behind the picture frames

Lower Ante-Room

Behind the tapestries and picture frames

Chinese Bedroom

None

Basement^*

On most visible surfaces