Watercolour painting of Double Mosaic, c. AD180.

Archaeology (Verulamium Museum)

Watercolour painting of Double Mosaic, c. AD180. This mosaic is now in the Alban Arena. Mosaics are made from small tiles known as tessera (plural: tesserae), normally made from cut stone, tile or, rarely, glass. They were used to floor important rooms such as dining rooms and bath suites. The basic floor structure was 'opus signum' (concrete). The tesserae were then pressed into a thin layer of fine mortar which was spread over the concrete. The tesserae were grouted with a fine mortar and the surface of the floor polished with abrasive stone. Many mosaics of elements within them were prefabricated as panels in the mosaicists' workshop and subsequently incorporated into the overall scheme 'on site'. Mosaics were laid from around AD 150 to 300 and continued to be repaired for a further century.

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i] 120 trany

Jennifer Golding

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