Naphthalene was most often used as a remedy against moths. In the Soviet Union, this substance was sold in hardware stores mainly in the form of balls, which were laid out in cupboards and on mezzanines.
The main disadvantage of naphthalene, undoubtedly, was its pungent smell, just thanks to which harmful insects did not start in the house. However, this was far from the only negative quality of the substance. The fact is that naphthalene in no way harmed either butterflies or their larvae. And over time, the moth became more resistant to the aroma of naphthalene and was no longer afraid of it.