| Black Plate | Code | Surface Finish | Characteristics |
| Single Reduce | B | Bright Surface | Glazed surface obtained by a thin layer of chromium and |
| chromium oxide deposited on the smooth steel base with |
| extremely fine stone figures by processing. |
| R | Stone surface | Glazed surface obtained after a thin layer of chromium and |
| chromium oxide deposited on the smooth steel base featuring |
| certain oriented stone figures. |
| R2 | Stone rough surface | Glazed surface obtained after a thin layer of chromium and |
| chromium oxide deposited on the smooth steel base featuring |
| certain oriented stone figures, roughness higher than "R" |
| M | Matt surface | Matt surface |
| Double reduced | R | Stone surface | Glazed surface obtained after a thin layer of chromium and |
| chromium oxide deposited on the smooth steel base featuring |
| certain oriented stone figures. |
Complaint
