Note 300 — AGAMEMNON

Here, and again in v. 612, we have a similitude drawn from the metallurgy of Greek artists. Good bronze, made of copper and tin, takes the green rust which collectors prize, but when rubbed, the brightness reappears. If zinc be substituted for tin, as in our brass, or mixed largely with it, the surface loses its polish, oxidizes and becomes black. It is, however, doubtful whether this combination of metals was at the time in use, and the words may simply refer to different degrees of excellence in bronze properly so called.