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Fireworks produce many brilliant colours. The colours produced are often those seen when flame tests are carried out in a classroom lab. exercise (Atomic theory- Unit 1 VCE chemistry, Unit 2- Redox reactions).
The combustion reaction itself involves a redox reaction to occur- oxidation. Tthe fuel that is burnt contains the various colours needed to produce the desired colours. (VCE Chemistry Unit 3- combustion of fuels and redox reactions).