Lead (Pb)
One study found in Kuwait that lead poisoning in children from the age of 612 a month led to the death of 4 and 6 cases of diseases between mental retardation and lack of movement and speech delays.
It is worth mentioning that الكحلة and incense are not safe to use, since it has the proportion of lead and $ 4.6 91.8% and maximum allowable 1 part per million (ppm).
