How to identify two categories of mosquito-repellent incense

Mosquito-repellent incense has two kinds: one: poisonous mosquito coil incense is the 666 powder, pesticide and chemical pesticides such as DDT, 223 as the raw material made of mosquito-repellent incense, which can dispel mosquito, no kill, but it is because of the fog is harmful to human body health, often use can cause dizziness, nausea, phenomena such as poisoning.2: safe mosquito-repellent incense is made of deinsectization agent such as herbs, the smoke can paralysis mosquitoes killed, harmless to human body health.Their recognition method has the following kinds:

(1) the appearance: security mosquito-repellent incense processing fine, colour and lustre is uniform, bending force, ignition time around 7 8 hours.If the mosquito-repellent incense rough surface, the structure is loose, has big grain impurity (DDT) as at the end of the crystals are thin, easy to break, or short of ignition time, midway goes out, are not poisonous mosquito coil incense.

2. Smelling aroma: Chinese herbal medicine, pyrethrum mosquito repellent after fire, smoke is not strong, people can smell the scent of a natural, no pungent, giddy feeling;Mosquito-repellent incense and DDT in opened the package and the ignition process, the smell of camphor ball, wen jiu feel dizzy.

3. From ignition to distinguish: ignition coil with matches, pure pyrethrum mosquito repellent only yellow flame and bluish white smoke, and toxic mosquito-repellent incense burning have a green flame and smoke.

4. From the mosquito-repellent incense ash to distinguish: pyrethrum mosquito-repellent incense burning ash after a white, grey;And poisonous mosquito coil incense ash is dark.

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