
Ground mica powder, now worn and cracked, originally made the night sky of this print luminous, providing a fitting backdrop to the glow of the fireflies. Artists used mica intermittently from the 1790s into the early 1800s in order to create more luxurious prints. From time to time, the government employed sumptuary laws—laws preventing extravagance—to ban the use of mica because it made prints too expensive.
Even when it was legal to do so, artists likely produced mica backgrounds in limited numbers. Probably fewer than 20 prints with this design have survived, and most of them are now in museum collections.

Komurasaki of the Miuraya and Shirai Gompachi (Miuraya Komurasaki, Shirai Gompachi)
Kitagawa Utamaro 喜多川 歌麿 Japanese, c.1753-1806

Hamamatsu, from the series "Fifty-three Stations of the Tokaido (Tokaido gojusan tsugi)," also known as the Tokaido with Poem (Kyoka iri Tokaido)
Utagawa Hiroshige 歌川 広重 Japanese, 1797-1858

Mitsuke: Ferries Crossing the Tenryu River (Mitsuke, Tenryugawa funawatashi), from the series "Fifty-three Stations of the Tokaido (Tokaido gojusan tsugi)," also known as the Tokaido with Poem (Kyoka iri Tokaido)
Utagawa Hiroshige 歌川 広重 Japanese, 1797-1858