| MDA | Malondialdehyde |
| H2O2 | Hydrogen peroxide |
| DAB | 3,3′-diaminobenzidine |
| CVS | Computer vision system |
| NMDS | Non-metric multi-dimensional scaling |
| ROS | Reactive oxygen species |
| INOW | Inowrocław |
| CIECH | Ciechocinek |
| SALZ | Salzgraben Salzdahlum |
| SOLTQ | Soltauquelle |
| ΔE | Colour difference vs. white plate |
| ΔE′ | Intra-treatment colour difference |