St. Patrick is the patron saint of Ireland and is credited with having brought Christianity there in the fifth century.The ...

The dye is nontoxic. While the river only stays bright for several hours, some trace of color can remain for days. A second St. Patrick's Day parade was scheduled for Sunday on Chicago's South Side.

Unable to find any trace of the color, used on horse carts in the 1400s ... Dmitry Kostyukov for The New York Times Once the only blue dye in Europe, woad pigment made a fortune for the sun ...