| 摘要 |
The process for reducing the level of harmful substances in tobacco leaves comprises the following steps: steeping the leaves in a water bath at a temperature of between 13~C and 25~C for between 4 and 12 hours, cooling the leaves to a temperature not higher than -35~C; and gradually heating the leaves at an average rate of not more than 2.0~C/h up to a temperature of at least 35~C. |
