æt ðɪs tˈaɪm, hˈaɪkˈɑːntɹæst nˈɛɡətˌɪvz wɜː mˌeɪd jˈuːzɪŋ ðə wˈɛt plˈeɪt kəlˈoʊdiən mˈɛθəd ɐ səlˈuːʃən ʌv nˌaɪtɹoʊsˈɛljuːlˌoʊs ɪn ˈiːθɚ ɔːɹ ˈæsɪtˌoʊn ˌɔn ɡlˈæs.
At this time, high-contrast negatives were made using the wet plate collodion method (a solution of nitrocellulose in ether or acetone on glass).