Later that same year, Davy reported extraction of sodium from the similar substance caustic soda (NaOH, lye) by a similar technique, demonstrating the elements, and thus the salts, to be different.
lˈeɪɾɚ ðæt sˈeɪm jˈɪɹ, dˈeɪvi ɹᵻpˈoːɹɾᵻd ɛkstɹˈækʃən ʌv sˈoʊdiəm fɹʌmðə sˈɪmɪlɚ sˈʌbstəns kˈɔːstɪk sˈoʊdə nˈɑː ˌoʊˈeɪtʃ, lˈaɪ baɪ ɐ sˈɪmɪlɚ tɛknˈiːk, dˈɛmənstɹˌeɪɾɪŋ ðɪ ˈɛlɪmənts, ænd ðˈʌs ðə sˈɔlts, təbi dˈɪfɹənt.