Take a few threads from the warp and weft and burn them from their ends. When the thread stops burning, a very tiny ash ball might be left behind.Rub the ball in-between your fingers and smell the powdered ash. If it is pure silk, it will smell like burnt hair. Silk, wool, leather and hair all burn alike and form an ash ball. In case of artificial silk, the fibers will flare and burn out quickly there will be neither ash ball nor smell like burnt hair. This silk fabric test is sure to help you while buying silk fabric.
Imitation zari will turn black in a couple of years. Incidentaly, "pure gold" zari is a misnomer - it is not gold thread but has at its core a silk thread over which silver wire is twisted and then dipped in gold.
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