: While rhenium is stable at room temperature, it can oxidize at high temperatures. Keep bullion in a dry, airtight environment to maintain its luster.
: Known for high-purity elements. They offer 1-ounce bars, cubes, and "pennies" (99.9% purity).
Rhenium is not traded on major exchanges like the COMEX. You must purchase it through specialized physical metal dealers. 1. Specialized Metal Dealers