It says dragonfire is used while making valyrian steel, but it's from the show. It doesn't sound too off the table but I think we shouldn't add information from the show or did GRRM confirmed it in the dvds? I don't know? --The Prince of Thorns 14:57, 5 July 2014 (UTC)
There are two references to dragonflame being used to forge Valyrian Steel in the books, and the Sons of the Dragon reading confirmed it. Though I do agree it shouldn't be citing the show --RumHam 20:34, 5 July 2014 (UTC)
"one day you shall have from my hands a longsword like none the world has ever seen, dragon-forged and made of Valyrian steel." - Last chapter of Got
"Longclaw had been forged in the fires of old Valyria, forged in dragonflame and set with spells." - Jon XII in Dance.