Haint Blue: The REAL reason porches have blue ceilings.

The REAL reason  porches have blue ceilings.

In Gullah/Geechee tradition the color blue is used to keep evil
spirits away. The Gullah/Geechee call those evil spirits, Haints. The
practice was brought over from Africa during the slavery. The legend
of the Haint is they can't cross water, so because slaves couldn't
build motes around their houses, they would use a watery mixture of
blue around the openings of their homes. They hoped that the blue
mixture would confuse the Haints into thinking the paint was water.
During slavery, Haint Blue was made in pits, dug in the yard, using
limes, buttermilk, and indigo. The practice of using blue paint on houses still
goes on today, especially in the South. If you've traveled to places such as Charleston, SC or
Savannah, Ga you may have noticed that porch ceilings, shutters, and
the trim on houses are often blue. 

Picture Source: http://www.kitchenandresidentialdesign.com