Floo powder

From the Encyclopedia of Speculative Fiction - http://encyclopedia.wizards.pro

This silvery powder, invented in the 1200s by Ignatia Wildsmith, when thrown in the fire allows magical travel and magical communication between fireplaces connected to the Floo Network. The powder is thrown into the flames, which burst up emerald green. To travel, a witch or wizard steps into the flames and states his or her destination (another fireplace on the network). To communicate, the witch or wizard throws the powder into the flames and inserts only her or his head, again stating ther fireplace to which a connection is desired.

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