ðə baɪkɹˈoʊmeɪt slˈæʃ ɡˈʌm mˈɪkstʃɚ ɹᵻmˈeɪnd sˈɑːljuːbəl ɔnðə pˈɑːɹts ʌvðə tɹˈeɪsɪŋ pˈeɪpɚ ðæt wɜː ʃˈiːldᵻd fɹʌm lˈaɪt baɪ ðɪ oʊpˈeɪk ˈɛɹiəz ʌvðə nˈɛɡətˌɪv, ɐlˈaʊɪŋ ɪt təbi ɹᵻmˈuːvd, lˈiːvɪŋ ɐn ɪnsˈɑːljuːbəl pˈɑːzᵻtˌɪv ˈɪmɪdʒ.
The bichromate/gum mixture remained soluble on the parts of the tracing paper that were shielded from light by the opaque areas of the negative, allowing it to be removed, leaving an insoluble ‘positive’ image.