Dec. 15 (Bloomberg) --Copper declined for a second day, erasing an advance in early Asian trading, as some investors sold the metal to lock in gains after it climbed to a record yesterday, and as the dollar’s rebound reduced the appeal of commodities as alternative investments.

The metal for three-month delivery on the London Metal Exchange fell as much as 0.4 percent to $9,130 a metric ton, and traded at $9,133.75 by 2:16 p.m. Singapore time. Earlier the contract rose as much as 0.9 percent. It reached a record $9,267.50 a ton yesterday.