They did not, the idea of the dyed sails is from the Romantic era in European history, around the 1790-1850. There is no historical evidence that vikings dyed their sails or had helmets with horns, these are historical myths not fracts.
So they could be easily identified at great distances. For their comrades AND their enemies.
red stripes mean danger
Red food dye, commonly known as Red 40 or Allura Red AC, is a synthetic dye that is not sourced from any specific country. It is derived from petroleum and undergoes a chemical process to produce the final red color.
what
Leif Erikson
Greenland was named by Erik the Red. Vinland was named by Leif Ericson.
blood
Red Sails was created in 1979.
I believe he used a water with a dye in it, such as a red food dye maybe.
Red Sails to Capri was created in 1952.
yes blood
Red Sails in the Sunset - song - was created in 1935.
As of August 2012, The Red Sails has been in a private collection.
Yes, red dye.
Red dye can be combined with yellow dye or blue dye to make orange dye or purple dye. It is used in colouring capes. It is also used in the Goblin Diplomacy quest at the part when the goblins want orange goblin mail, and may be used in the Land of the Goblins quest again to dye armour, and in other quests requiring red, orange, or purple dye. 4 Red dye are used to make Decorative blood in a Player-owned house Dungeon, Oubliette, or Treasure Room.
Perhaps the most common use of eosin dye is in blood testing. Technicians mix the dye with a small amount of blood, then count how many cells absorb the fluorescent red dye. Several serious diseases cause a count of more than 500 eosinophils/microlitre of blood.
mix red and blue dye Red dye- redberries blue dye- woad leaves
golden syrup, red food dye and water that's how my friend makes it