What is a philosopher's wool?

The compound zinc oxide (ZnO) is called philosopher’s wool. ZnO residual has a wool like texture that’s why people named it the ‘philosopher’s wool’. ZnO is a white powder that is insoluble in water. Zinc oxide is used as an additive in sunscreens, sun lotions, in rubber manufacturing and in photocopying products. At old times people used ZnO for rituals. When it burns it gradually turns to a white woollen tufts.

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