Enamelled Tile Mosaic Ornamentation
The enamelled tile mosaic ornamentation which adorned Anatolian Sejukid buildings saw a gradual reduction in the early Ottoman architecture and new features began to emerge. If the examples at Bursa are viewed in terms of colour patterns, then the examples from the Seljukid period are richer. Together with typical Seljukid colours such as light blue, turquoise, fluoride violet and black, pistachio green, yellow and white were also used. In the Green Mosque and the Tomb as well as the Murat II Mosque in Bursa, both coloured glaze enamelled tiles and enamelled tile mosaic have been used, the latter being preferred for the upper parts of stuctures. In this technique the enamelled tiles, which have been selected according to the colour and the planned design and cut into tiny pieces, are placed with their glazed surface facing down wards in a mould in such a way as to form a motif and mortar poured over them. The backs of these pieces are slightly conical. After the mould has been removed, the resulting plates are applied to the walls. A flat or rounded surface can be easily achieved in enamelled tile mosaics. The pieces of tile, which have been fired separately according to their colour, are of excellent quality with vibrant colours. The clay used is of a yellowish grey and siliceous. The matt red, stone-hard putty, seen in places between the pieces of mosaic, add a touch of interest to the composition. In Sejır kid examples there are small pieces of enamelled tile mosaic with the dirty white mortar of the background visible in places, and this colour has been integrated into the composition. No mortar base is visible in the examples at Bursa because the mosaic pieces have been laid close together in an entegrity from which the design emerges.
Enamelled tile mosaic has been used to adorn the door and window frames of these buildings in Bursa. It is not possible to distinguish the differences between the mosaics of this type and the coloured glaze tiles from a distance.