Hot Potato! Considered a rare and exotic material in the 19th century; the smelting of aluminum began in earnest early in the 20th century with the incorporation of the Aluminum Company of America (ALCOA). Harry Greenberger of HG Limited has dedicated his collections to aluminum in its many forms. Mr. Greenberger’s interests in aluminum extend from practical kitchen equipment to quirky inventions like the Barton single potato baker from 1935.