Tea processing full oxidation and producing "Gongfu" black tea (工夫紅茶). When there was insufficient sun and temperatures were low, the withered leaves would be processed indoors in warmed rooms and allowed to fully oxidize, then smoked dry over pine fires thus producing lapsang souchong. According to oral traditions of the region, the discovery of lapsang souchong processing was due to military troops passing through a Wuyi's tea factory during the last years of the Ming Dynasty, causing delays to tea leaf processing thus resulting in a completely oxidized leaf that the producer salvaged by drying over a fire built from pine branches.
Tariff of 1790 and India, in ships or vessels of the United States, bohea, per pound, ten cents; souchong and other black teas, per pound eighteen cents, hyson, per pound, thirty-two cents; other green teas, per pound, twenty cents. Teas from Europe, in ships or vessels of the United States, bohea, per pound, twelve cents; souchong and other black teas, per pound, twenty-one cents; hyson, per pound, forty cents; other green teas, per pound, twenty-four cents. Teas from any other place, or in any other ships or vessel, bohea, per pound, fifteen cents; souchong and other black teas, per pound, twenty-seven cents; hyson,