Extraction Temperature
The duration of extraction is limited to the period in which white smoke is emitted, and does not include the period of initial smoke. Thus, extraction should begin when the temperature of the charcoal (earthen) kiln exhaust port is 80-84‹C and end when the temperature is 110-120‹C. If the smoke turns blue, the substance turns into fibrin-decomposed tar, thereby deteriorating the germicidal effect of the product