Lead free brass is still 0.2% or less. Mitsubishi makes it. "Eco brass". I'm not sure it's brass anymore without the lead. Why does it seem that the better a

Lead free brass is still 0.2% or less. Mitsubishi makes it. "Eco brass". I'm not sure it's brass anymore without the lead. Why does it seem that the better a material works the worse it is for humans.