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| Melanin content (%) | In vitro SPF | Critical wavelength | UVA/UVB ratio |
|---|---|---|---|
| 0% | 1.0 ± 0.1 | — | — |
| 0.5% | 1.4 ± 0.1 | 388.8 ± 0.5 | 0.88 ± 0.04 |
| 1% | 1.5 ± 0.1 | 388.8 ± 0.4 | 0.90 ± 0.02 |
| 3% | 2.0 ± 0.2 | 388 | 0.84 ± 0.01 |
| 5% | 2.5 ± 0.1 | 388 | 0.87 ± 0.01 |
