Shanghai aluminum and nickel prices fell on Tuesday, as investors exercised caution ahead of key U.S. inflation data and reduced exposure after a supply shortage-driven rally in both metals earlier this month. The most-traded October aluminum contract on the Shanghai Futures Exchange fell 3% to 22,660 yuan a tonne at 0355 GMT, retreating after eight straight sessions of gains.ShFE nickel dropped as much as 4.3% to 146,280 yuan a tonne, retreating from its record high of 155,140 yuan a tonne hit two sessions earlier. ShFE copper fell 1.3% to 70,360 yuan a tonne, zinc declined 1.4% to 22,670 yuan a tonne and lead ... (full story)