normally commodities open against the trend,once in the morning.what it means,suppose trend in copper is long when market close to day at 11.30 pm MARKET CONSISTS OF TWO TYPE OF TRADERS,ONE OF THEM ARE CALLED STRONGER HANDS(THESE ARE THE PROFESSIONAL TRADERS WITH FULL OF MONEY AND KNOWLEDGE BOTH)
SECOND OF THEM ARE CALLED WEEKER HANDS WITH LIMITED CAPITAL AND LIMITED KNOWLEDGE(THESE MAY BE CALLED FLUKE TRADERS)WHEN THEY GET SOME GOOD PROFIT ,IT IS ALWAYS BEYOND THERE EXPECTATION,SO SUPPOSE FEW OF THEM ARE HOLDING COPPER TO DAY WHICH CLOSED STRONG TO DAY,AS A RESULT IN MORNING COPPER OPEN GAP UP AND ALL OF THEM WILL TELL THEIR BROKER TO SELL COPPER AT ONCE,SINCE THEY WANT TO SNACH THIS PROFIT FROM MARKET ,AS A RESULT, OF SELLING AT ONCE FROM WEEKER HANDS COPPER WILL COME DOWN,WITH IN ONE HOUR ALL THESE AGAINST THE TREND MOVE WILL SETTLE,IF WE WILL BUY COPPER AFTER THAT IT WILL BE PERFECT,OTHER WISE IT IS PRE MATURED BUYING,ONE HOUR PERIOD IS APPROX WHICH REQUIRE TO SETTLE THE THINGS