2. Mothballs are divided into natural mothballs and synthetic mothballs. Natural mothballs are smooth, colorless or white crystals with fragrant smell, which will float in water. Natural mothballs, also known as smelly beads, are used to prevent insects, moths and mildew. They were originally aromatic organic compounds extracted from camphor tree branches and leaves. It is also used in pharmaceuticals, spices and so on. Used as a cardiotonic in medicine.
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