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Choya Loban Gum frankincense is processed by distillation method from ancient times before the development of stainless steel. Common construction material in old times for distillation equipment was copper. Because of the presence of acid during processing copper reacts with metal and creates holes in the vessel and the entire biomass forms a coating inside vessels and sticks in thick layers.
In order to solve this problem distillers in ancient India developed a unique method which is known in modern time as destructive distillation. In this process they collect the fresh resins with high percentages of oils. This resin is charged to a clay vessel with a top lid and a goose neck on the other side.