In studies that have been done through many places and going back to the late 80’s they have found that as long as the content is no more than 35 percent these are perfectly safe to use.
Uuringute järgi mida on tehtud paljudes riikides alates 80te lõpust siiani on avastatud, et kui koostises on seda kuni 35%, siis on see täiesti ohutu.