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Date completed : 27 April 2020 Duration : Ongoing
Peter David

Treatment of Ceramics

A LLANELLI  LITHOPHANE  USED AS FIRESCREEN.

The circular. lithophane was moulded with “Night” after Bertel Thorvaldsen (1770-1844), a Danish sculptor., and mounted in a tin plate frame, on a turned and carved mahogany handle.

CONDITION

The lithophane had surface dirt and dust and was broken into six pieces,; there were attendant chips and losses.

                                                                 

TREATMENT

The lithophane was dry brushed to remove any surface dirt.

In order to treat the Lithophane it was necessary to remove it from its frame.

The plaque, and consequently the shard edges had been bedded in plaster of Paris, within the frame; they had also been painted with black paint around the edges.

                                        c

These residues were removed mechanically and chemically, to prevent contamination of treatments at a later stage.

The lithophane was immersed in a solution of Biological detergent to remove surface dirt and residues, the break edges  were then cleaned with a solution hydrogen peroxide + ammonia. After treatment the lithophane was rinsed and allowed to dry.

The cleaned sections were taped into their correct postions, and bonding was carried out with a low-viscosity resined which was applied using capillary action.

There were some minute losses from the fabric of the plaque which meant that even a tight join did not exclude light but allowed it to pass through uninterrupted. In order to get around this a small quantity of fumed silica and zinc white were mixed into the bonding medium.

Larger losses were filled with the same resin bulked with fumed silica and artists’ dry ground pigments. It was necessary to ensure that all pigments used were translucent rather than opaque.

The fills were fettled with scalpels and  micro-mesh cloths

The lithophane after filling and fettling

One area was still transmitting too much light, so a fine line of opaque pigment + Acrylic ceramic glaze was painted along it. To reduce this effect.

The lithophane was  reseated within in it’s frame.

The treated lithophane illuminated from behind.

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