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Natural and synthetic ultramarine blue pigments employed in this study.
| Sample code | Kremer name | Kremer reference |
|---|---|---|
| NU-1 | Purified lapis lazuli | 10530.12010.315 |
| NU-2 | Lapis lazuli, good quality | 10520.12010.104 |
| NU-3 | Lapis lazuli, medium quality | 10510.12010.104 |
| NU-A | Ultramarine ash | 10580.12050.104 |
| SU | Ultramarine blue, dark | 45010.12100.136 |
