The flame first ran on colza oil. These lamps were fueled by vegetable oil such as colza oil or rapeseed oil. The main crops are maize, wheat and colza. Natural pyrethrin insecticides, extracted from "Chrysanthemum" and mixed with colza oil, can also be used. Aniline was used to denature colza oil in the 1980s. The earliest form of train lighting was provided by Colza oil lamps. In 1892, sperm oil was replaced by better quality colza oil. Colza oil is also used as a food oil. In 1840, a colza oil lamp was installed. Colza oil is extensively used as a lubricant for machinery. The burners for the lights were changed from colza oil to paraffin oil in 1876. For this purpose, colza oil was carried in ship's lifeboats. In 1887 the colza oil lamp was replaced with a kerosene lamp. In 1862, colza oil and later in the century, kerosene were used as fuel. Colza was burned to a limited extent in the Confederacy during the American Civil War.