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2. Fatimid
or early Mamluk footed cup
In the bottom right of the same case
The decoration on this cup is called marvering, after
the marble slab on which the object was rolled in order to bed the
white trail of glass into the cups surface. The white trail
was then combed or dragged up to create a feather pattern. The purple
colour derives from manganese oxide, the white from tin oxide. Marvered
decoration was common on Syrian glass in the 12th and 13th centuries,
usually on purple, but occasionally on blue and green glass.
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