ðə dˈeɪndʒɚɹ ɪz ɡɹˈeɪtli ɪŋkɹˈiːst wɛn ðə mətˈɪɹiəlz ɑːɹ mˈɛltᵻd dˌaʊn ɔːɹ wˈɜːkt baɪ hˈænd, ɛkspˈoʊzɪŋ wˈɜːkɚz tə tˈɑːksɪk fjˈuːmz.
The danger is greatly increased when the materials are melted down or worked by hand, exposing workers to toxic fumes.