You've tried the regular marker on that dark panel and it vanished. Or you marked a glass partition and the ink bled straight through to the other side. This is the fix. The Staedtler Lumocolor Omnigraph sits at 12 mm diameter, lays down opaque black on paper, plastic, metal, glass, wood, leather, and stone — dark or transparent, doesn't matter. Waterproof once dry. No bleed-through. A box of 12 means your whole crew's covered without a second trip to the store
| 0 | paper |
| 1 | plastic |
| 2 | metal |
| 3 | glass |
| 4 | wood |
| 5 | leather |
| 6 | stone |
| brand | STAEDTLER |
| colour | Black |
| diameter_mm | 12 |
| pack_size | Box of 12 |
| waterproof | 1 |
| category | Office Supplies |
| subcategory | Writing & Correction |