The Ferrotype Quarterly Vol. IX Chapter Three · The Long Sitting
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Finding № 14 · Exposure economics

The plate rewards patience; the sitter pays for it in minutes.

Mean exposure time per portrait, 1855 — 1900 · seconds
90s 60s 30s 10s 2s 1867 · 72 sec — North River studio standard 1898 · 4 sec — gelatin emulsions arrive 1855 1865 1872 1880 1887 1894 1900 Daylight wet-plate portrait Gaslit studio sitting (interior)
This is the Tintype Wet Plate design system, applied by Curio Design — a design-style library for AI agents. Full Tintype Wet Plate guide → designbycurio.com/learn/tintype-wet-plate