ðə fˈɜːst ˈɑːbdʒɛkts ɪn ˈoʊpəlˌaɪn ɡlˈæs wɜː mˌeɪd ɪn mjʊɹɹˈɑːnoʊ ɪnðə sˈɪkstiːnθ sˈɛntʃɚɹi, wɪððɪ ɐdˈɪʃən ʌv kˈælsiəm fˈɑːsfeɪt, ɹɪzˈʌltɪŋ fɹʌmðə kˌælsᵻnˈeɪʃən ʌv bˈoʊnz.
The first objects in opaline glass were made in Murano in the sixteenth century, with the addition of calcium phosphate, resulting from the calcination of bones.