After months of being ignored in favor of market darling palladium, platinum is finally getting some attention from investors. The metal, which is mostly used to make jewelry and reduce emissions from car exhausts, is trading near the highest since May and money is pouring into platinum-backed exchanged-traded funds. Prices have gained as expectations for tough wage negotiations this year in top producer South Africa raised the threat of supply disruptions, and platinum’s cheapness relative to other precious metals is also prompting a second look by investors.