Naphthalene is a chemical compound that is used in products like mothballs and some cleaning agents. It has a strong, distinct smell and is often used to repel insects or as a disinfectant. Full definition
Nowadays these bags offer a very low oxygen migration rate and are an effective barrier to the organic materials (such as naphthalene) that can taint the wine. (ibwsshowuk.com)
Symptoms associated with ingesting mothballs with naphthalene include vomiting, diarrhea, anemia, weakness and collapse. (dog-health-guide.org)
Just one mothball has the potential to sicken a dog or cat and mothballs that contain naphthalene can cause serious illness, including digestive tract irritation, liver, kidney and blood cell damage, swelling of the brain tissues, seizures, coma, respiratory tract damage (if inhaled) and even death (if ingested). (vscot.com)