Images were published from original drawings using a zincography, planographic printing process. The prevalence of the new zincography printing process rendered xylography nearly obsolete as a profession. From the mid-1870s Busch's illustrations were printed using zincography. Busch's use of zincography began with "Mr. and Mrs. Knopp". Zincography is frequently confused with modern zinc-plate lithographic printing. Busch's illustrations used wood engraving, and later, zincography.