ðə tˈɜːm wʌz ˈɔːlsoʊ ɐplˈaɪd tə ɹˈɛd vˈɪtɹiːəl ɐ nˈeɪɾɪv sˈʌlfeɪt ʌv kˈoʊbɔlt, ænd tə ɡɹˈiːn vˈɪtɹiːəl fˈɛɹəs sˈʌlfeɪt.
The term was also applied to red vitriol (a native sulfate of cobalt), and to green vitriol (ferrous sulfate).