wˈʌns ðə nˈɛɡətˌɪv hɐdbɪn mˈeɪd, ɐ ʃˈiːt ʌv θˈɪn tɹˈeɪsɪŋ pˈeɪpɚ wʌz kˈoʊɾᵻd ɪn ɐ mˈɪkstʃɚɹ ʌv sˈætʃɚɹˌeɪɾᵻd pətˈæsiəm baɪkɹˈoʊmeɪt səlˈuːʃən ænd ɡˈʌm wˈɔːɾɚ, ænd dɹˈaɪd.
Once the negative had been made, a sheet of thin tracing paper was coated in a mixture of saturated potassium bichromate solution and gum water, and dried.