• Schematic: Blue Firework
• Item Level 30Disenchants into:
  Not disenchantable
• Requires Engineering (150)
• Use: Teaches you how to make a Blue Firework.
• [Blue Firework]
• Requires Heavy Blasting Powder, Heavy Leather
• 1 Charges
• Sell Price: 4 50
• Vendor 18

Teaches how to create a [Blue Firework].

Source

This is a Limited sale recipe available for 18 from

•  Gearcutter Cogspinner in Ironforge
•  Darian Singh <Fireworks Vendor> in the Mage Quarter in Stormwind

Patch changes

• Patch 1.4.0 (2005-05-05): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB