| Duration of Exposure Hours | Cherry | Hickory | Pecan | |||
| Weight gm | Gain in Weight | Weight gm | Gain in Weight | Weight gm | Gain in Weight | |
| 0 | 2.5540 | - | 2.5064 | - | 2.5546 | - |
| 1 | 2.5588 | 4.8 mg | 2.5102 | 3.8 mg | 2.5588 | 4.2 mg |
| 4 | 2.5667 | 12.7 mg | 2.5164 | 10.0 mg | 2.5647 | 10.1 mg |
| 9 | 2.5660 | 12.0 mg | 2.5164 | 10.0 mg | 2.5644 | 9.8 mg |
| 21 | 2.5662 | 12.2 mg | 2.5164 | 10.0 mg | 2.5647 | 10.1 mg |