Note 1 — Chapter VI · Gold, and How they Came to Use It.

In one of the mints there is exhibited as a curiosity a case in which this fact is demonstrated in the most striking manner. It contains some fifty or more very thin ribbons, or strips, of gold, half an inch wide by three inches in length, placed in a row, parallel to, but separated from each other by a slight interval. The first ribbon is composed of gold of the highest standard of purity; the second differs from the first to the extent of one per cent. of admixture with a baser metal; while the third contains two per cent., the fourth three per cent., and so on, until in the last ribbon, or strip, the amount of gold and alloy is equal. The color of the first ribbon is, in the highest sense of the term, golden or typical. The color of the second differs from the first by a shade, which shade in every successive ribbon changes and becomes more and more marked as the proportion of alloy entering into its composition increases: and so peculiar are these differences of color that it is possible for an individual unskilled in metallurgy, but having access to the standard, to make a comparatively accurate test of the purity of any article of gold in his possession by a simple comparison of color.