The surface appearance of the various metals after final treatment such as rolling, etc. Over the years the following finishes have become recognized as standard in their respective fields ALUMINUM SHEET (A) Commercially Bright (B) Bright one side (C) Bright both sides BLACK PLATE (A) Dull finish without luster produced by use of roughened rolls. (... Found on https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/