Yes it is. In fact there's a golden thread fish. It has a golden
tail.(Not real shiney gold.)
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The thread size is: M3.0-.5 The Browning part number for the
bead is B1116580
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60 metre
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Catherine Black has written:
'A hard gold thread'
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I believe it is called filigree. There is also an embroidery technique in which metallic threads are sewn to the fabric with a contrasting color thread, called Or nue.