1. Construction of fireworks Fireworks are made by pyrotechnists. The way is handmade style still now. Fireworks are constractional of round shell. Package is called Tamakawa. Stars are called Hoshi. Fuse is called Michi. Gun powder is called Warikayaku, Hadanyaku. Facing paper is called Uwahari-shi. Cut off paper is called Hasamigami. Cannon is called Ryuzu. Mostly using Japanesed paper "Washi or Gampishi."
2. Colors of fireworks
A color of fireworks apply "flame reaction." It is that burn chemical compround include specific element, flame up it with peculiar color of each element.
The star of fireworks can been make by mixing chiefly three powders. It is a combustion material which promotes the oxidant and combustion by which the chemical and oxgen by which the color is put out are supplied. Red is used Strontium carbonate. Green is used Barium nitrate. Yellow is used Calcium carbonate. Blue is used Copper oxide. Silver is used Aluminium.These are an example of chemicals as a color former. Changing color of star on the way is original technology (Changing color star) of the Japanese fireworks. It is a concentric sphere consist of some layers of powder which each burns a different color each other. This type star, we call "Kakeboshi=multi coated star". Put standard material like a rape seed or ceramics grain in center, and coat powder over it again and again in due order. This coating work perform by "Star-rolling machine" at present.
http://www.japan-fireworks.com/basics/waza.html
Nozomi
Last updated 6-Dec-2001