Good incense won't have a sour smell or irritate the nose, and its smoke won't irritate the eyes and cause them to tear. If ashes from the incense that fall onto the hand have a scorching feel, then the maker added lime. The ashes from low-quality incense containing chemical additives are much lighter in color.
使用天然材料製成的香，聞起來不會有酸味或刺鼻感、眼睛也不會受煙霧刺激而流淚，如果香灰掉在手上有灼熱感，就是添加了石灰；劣質香的香灰顏色較沉香白得多，就是添加了不明化學物質。