Researchers have discovered a blue dye described in the Bible. It was found on a piece of wool cloth which is thought to be almost 2,000 years old. It was discovered in a cave in the West Bank. The caves are the same caves where the Dead Sea Scrolls were found. Blue and purple were considered the most precious of dyes, this one made from snails. I have included a link below for more information.
Elusive biblical blue dye found