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True Initiate
11-06-2010, 09:11 AM
Interesting article

A great degree of confusion existed for the ancients in regard to the source and identity of dragon's blood. The resin of Dracaena species, "true" dragon's blood, and the very poisonous mineral cinnabar (mercury sulfide)[1] were often confused by the ancient Romans, and there appears to have been a tendency to call anything that was bright red "dragon's blood".

http://en.wikipedia.org/wiki/Dragon%27s_blood

Aleilius
11-06-2010, 09:26 AM
There's also the blood of mercury (dye of mercury, metallic sulphur of mercury, etc) to consider as the "true" dragon's blood.

Also, molten elemental sulfur looks like red blood.

http://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Burning-sulfur.png/220px-Burning-sulfur.png