The main function of camphor pills is to prevent borers. Naphthalene pills are chemical synthetic products, toxic and carcinogenic. Some businesses use naphthalene pills as camphor pills. Here are two ways to distinguish them for your health.

方法一：取一杯水（常溫自來水即可），真正的樟腦丸放入水中會漂浮在水面上，而萘丸會沉入水中，皆因二者的密度不同。
      

Method 1: take a cup of water (tap water at normal temperature), the real camphor pill will float on the water surface, while the naphthalene pill will sink into the water, both due to the different density of the two.

方法二：取一杯剛開的沸水（100度），將二者分別放入水中攪拌，萘丸進(jìn)入沸水中會逐漸融化，而樟腦丸不會有變化，皆因二者的沸點不同。

Method 2: take a cup of just opened boiling water (100 degrees), put the two into the water separately and stir, the naphthalene pill will gradually melt into the boiling water, while the camphor pill will not change, because of the different boiling points of the two.

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