One Thousand Ways to Make Money by Page Fox

manufacture of any article which is procured from nature at great expense. This is the case with marble. It is scarce at best; the quarries are remote from the centers of population, and the mining and transportation make it a very costly article. Marble can be manufactured by imitating nature’s processes--the percolating of water through chalk. The popular verde antique can be made by an application of an oxide of copper. The slices of marble are then placed in another bath, where they are hardened and crystallized, coming out exactly like the real article. In Italy, a fine black marble is made from common white sandstone. The manufacture is carried on by the owners of the local gasworks, who thus reap a double profit from their plant. Here is a hint for American manufacturers.