New Delhi: Copper prices on Friday slipped by 90 paise to Rs 529.80 per kg as participants cut down their positions amid muted demand in domestic market. On the Multi Commodity Exchange, copper contracts for October delivery eased by 90 paise, or 0.17 per cent, to Rs 529.80 per kg in a business turnover of 5,531 lots.

Analysts said trimming of positions by speculators due to muted demand in spot market mainly led to the fall in copper prices here.