Refers to fine particles or powder of gold, often used in traditional crafts or decoration.
Gold dust is used in maki-e lacquerware.
Compound of 金 (kin, 'gold') and 砂子 (sunago, 'sand dust, fine sand'). The reading きんすなご is a straightforward combination of the on'yomi of 金 and the kun'yomi of 砂子.