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Interpretation of color chart analysis.
| The symbol | Meaning | Color comparison (times measured) | Period (days) |
|---|---|---|---|
| ΔE 1 | Using the color values read in the C.I.E. LAB system (L ∗, a ∗, b) to compare the color difference (ΔE) from the formula: |
1 and 2 | 1 to 4 |
| ΔE 2 | 1 and 3 | 1 to 7 | |
| ΔE 3 | 1 and 4 | 1 to 10 |
