sulfurize
[ suhl-fyuh-rahyz, -fuh- ]
/ ˈsʌl fyəˌraɪz, -fə- /
verb (used with object), sul·fu·rized, sul·fu·riz·ing.
to combine, treat, or impregnate with sulfur.
to fumigate with sulfur dioxide.
Also
especially British,
sul·phu·rise.