| Code Value |
Definition |
| 1A | Paper |
| 1B | Cardboard |
| 1C | Unfinished/raw wood |
| 1D | Other/unknown porous substrate |
| 2A | Plastic |
| 2B | Glass |
| 2C | Metal, painted |
| 2D | Metal, unpainted |
| 2E | Glossy painted surface |
| 2F | Tape, adhesive side |
| 2G | Tape, nonadhesive side |
| 2H | Aluminum foil |
| 2I | Other/unknown nonporous substrate |
| 3A | Rubber or latex |
| 3B | Leather |
| 3C | Photograph, emulsion side |
| 3D | Photograph, paper side |
| 3E | Glossy or semi-glossy paper or cardboard |
| 3F | Satin or flat finish painted surface |
| 3G | Other/unknown semiporous substrate |
| 4A | Other substrate (Specify) |
| 4B | Unknown substrate |