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The Dark History of Indigo, Slavery's Other Cash Crop
history.howstuffworks.com/world-history/indigo.htm
HowStuffWorks traces the history of indigo from its origins and use as a cash crop for blue dye to its replacement by synthetics in the 20th century.
The Gullah Geechee Tradition of 'Haint Blue' Paint Keeps the Spirits Away
history.howstuffworks.com/history-vs-myth/haint-blue.htm
The Gullah Geechee people painted porch ceilings blue to trick haints into thinking their houses were surrounded by water, which a haint can't cross.
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