Table 1.
Color change quantification according to the National Bureau of Standard (NBS).
| Critical Marks of Color Difference | NBS Units |
|---|---|
| Trace | 0.0-0.5 |
| Slight | 0.5-1.5 |
| Noticeable | 1.5-3.0 |
| Appreciable | 3.0-6.0 |
| Much | 6.0-12.0 |
| Very much | >12.0 |
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