How to distinguish between two different types of mosquito-repellent incense

Their recognition method has the following kinds:

1. See 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.

5. From extermination effect analysis: pyrethrum mosquito coil incense to mosquito toxic effect is obvious, when lit to see mosquitoes flying;And poisonous mosquito repellent lit after mosquito disorderly bump, efficacy than pyrethrum.

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