Official Journal of the Japan Wood Research Society
Table 1 Color change classification
Class | Color difference | Color change effect |
|---|---|---|
1 | ΔE < 0.2 | Invisible changes |
2 | 0.2 < ΔE < 2.0 | Very small changes |
3 | 2.0 < ΔE < 3.0 | Small changes (color changes visible by high-quality filter) |
4 | 3.0 < ΔE < 6.0 | Medium (color changes visible by medium-quality filter) |
5 | 6.0 < ΔE < 12 | Big (distinct color changes) |
6 | ΔE > 12 | Different color |