Chromolithography was state of the art color printing in the late 1800s. It made fine art prints available to the middle class. The inks are still rich and bright a hundred years later.
These unexpectedly vivid illustrations show up in otherwise unremarkable children’s books. They are a delightful surprise inside dingy covers, the color pictures on better paper interleaved with acid-tanned text pages.
Here are some from a book of nursery rhymes, 1900, about 5×7 inches:
Schöne Bilder. “Wie das kind Sein Soll” ist unauffällig? Schade.