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Fossil fuels, such as petroleum and coal, naturally contain naphthalene. Burning tobacco or wood produces naphthalene. The major products made from naphthalene are moth repellents, in the form of mothballs or crystals, and toilet deodorant blocks.
Phenol has been in production since the 1860s. One of the early uses for phenol was as an antiseptic. Towards the end of the 19th century, industrial scientists found new uses for phenol in the synthesis of dyes, aspirin, and one of the first high explosives, picric acid.