and linoleum, and in more ancient times was a critical component in creating durable earthen floors. In Japan, perilla oil was important for fueling oil lamps until early 16th century, before it was overtaken by rapeseed oil. The oilseed contains drying oil elements and was imported in bulk as a substitute for linseed oil into the United States from Japan, until the supply was interrupted by war. In Korea, perilla oil pressed from the untoasted seeds were used to fuel lamps and to oil floor papers. Use of press cake The press cake remaining after pressing perilla oil can be used as natural fertilizer or animal feed. Safety Perilla oil is categorized as Hazard Grade III of Class 4 Hazardous Substances, by Presidential Order 33005 of Act On The Safety Control Of Hazardous Substances of the Republic of Korea. It is mainly due to its high iodine value (over 130), thus having a small probability of spontaneous combustion. References Cooking oils Condiments Vegetable oils Korean condiments