Liquid ammonia, ether, or hydrocarbon solvents are used, the most common of which being tetrahydrofuran.
lˈɪkwɪd æmˈoʊniə, ˈiːθɚ, ɔːɹ hˈaɪdɹəkˌɑːɹbən sˈɑːlvənts ɑːɹ jˈuːzd, ðə mˈoʊst kˈɑːmən ʌvwˈɪtʃ bˌiːɪŋ tˈɛtɹɐhˌaɪdɹəfjˌʊɹɹən.