| Clay | Source | Color | pH ± 0.034 |
| A | Kajansi | Dark grey | 5.96 |
| B1 | Seeta | Yellow-grey | 6.10 |
| B2 | Seeta | Orange-brown | 4.95 |
| C | Lwanda | Whitish-grey | 5.60 |
| D | Nakawa | Reddish-brown | 5.75 |
| E | Kawuku | Dark brown | 6.40 |
| F | Umatenga | Grey-yellow | 6.30 |
| G | Chodah | Grey-yellow | 6.80 |
| H | Ngero | Dark-grey | 6.60 |
| I1 | Budadiri | Dark brown | 5.60 |
| I2 | Budadiri | Dark grey | 5.65 |
| I3 | Budadiri | Dark grey | 6.50 |
| J1 | Mutufu | Grey | 6.90 |
| J2 | Mutufu | Dark grey | 8.40 |
| K | Siron | Brown | 6.80 |
| L | Chelel | Whitish grey | 7.90 |