[lightarrow (OP)]

Some days ago, during a firworks exhibition, they shooted fires to a river, that then kept burning on the water's surface with very brilliant and long-lasting red light.

What are they made of?

(I'm not wondering about the flame's colour: it could be Ca, Li, Sr).

[daveshorts]

I think they make them using phosphorous which burns extreemly brightly and will burn in and with water.

[ROBERT]

Red fireworks can be created by adding Strontium or Lithium salts.  
http://chemistry.about.com/library/weekly/aa062701a.htm

[daveshorts]

I think they make them using phosphorous which burns extreemly brightly and will burn in and with water.

[ROBERT]

Red fireworks can be created by adding Strontium or Lithium salts.  
http://chemistry.about.com/library/weekly/aa062701a.htm