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| Color, number of reference solution Gardner | Color, mg J2/100 cm3 | Color, number of reference solution Gardner | Color, mg J2/100 cm3 |
|---|
| 1 | 3–4 | 10 | 40–60 |
| 2 | 4 | 11 | 60 |
| 3 | 5 | 12 | 80 |
| 4 | 7 | 13 | 100 |
| 5 | 10 | 14 | 130 |
| 6 | 15 | 15 | 160 |
| 7 | 20 | 16 | 250 |
| 8 | 30 | 17 | 400 |
| 9 | 40 | 18 | 1100 |
