Art Spectrum® Lamp Black is the most opaque and blackest black. Lamp Black is a cool, very slow drying black with a slightly blue undertone.
| Pigments | Lightfastness | Permanence | Transparent/Opaque |
| PBk7 | ASTMI | **** (excellent) |
Opaque |
ASTM Approved Permanent Colours American Society for Testing and Materials, conforming to standard D4302-90.
