Industrial metals are showing “manifestly bearish signals,” said Dennis Gartman, the economist who correctly forecast the commodities slump of 2008. “Copper’s major upward sloping trend was broken months ago,” he wrote in the Gartman Letter today. Aluminum has also broken its trend line and the same case can be made “perhaps even more definitively so” for tin, he said. Firming in commodity prices may be “transitory for too many of the markets are failing,” Gartman said. “Good, strong markets move on to new highs readily rather than in a laboring, coughing, wheezing fashion as so many of the commodity markets seem to be doing in the past several days and over the course of the past several weeks,” the economist said. To contact the reporter on this story: Agnieszka Troszkiewicz in London at atroszkiewic@bloomberg.net To contact the editor responsible for this story: Claudia Carpenter at ccarpenter2@bloomberg.net

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