That said, the example photographed is transfer-printed (as opposed to hand-painted), and transferware first appeared (experimentally) around 1765, so that's not much help. Also, the flowing technique was successfully used off and on prior to 1800, but by agreement - not "definition" - the products so made are not considered "flow blue."
This is where the "mid 1840's" comment above comes from. Some experts stretch the opening date of flow blue to the 1830's, but the agreement on items that date before then is pretty much 100%.
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