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Photographer's Note

This display was spotted following yesterdays National Day Parade in
Singapore.

Salts are used to colour the fireworks. Commonly used ions include:

RED - strontium salts, lithium salts
lithium carbonate, Li2CO3 = red
strontium carbonate, SrCO3 = bright red

ORANGE - calcium salts
calcium chloride, CaCl2
calcium sulfate, CaSO4·xH2O, where x = 0,2,3,5

GOLD - incandescence of iron (with carbon), charcoal, or lampblack

YELLOW - sodium compounds
sodium nitrate, NaNO3
cryolite, Na3AlF6

ELECTRIC WHITE - white-hot metal, such as magnesium or aluminum
barium oxide, BaO

GREEN - barium compounds + chlorine producer
barium chloride, BaCl+ = bright green

BLUE - copper compounds + chlorine producer
copper acetoarsenite (Paris Green), Cu3As2O3Cu(C2H3O2)2 = blue
copper (I) chloride, CuCl = turquoise blue

PURPLE - mixture of strontium (red) and copper (blue) compounds

SILVER - burning aluminum, titanium, or magnesium powder or flakes.

Cropped & framed.

Comments and observations invited.

Regards,

Vic, Singapore. 10th August 2004

bfly, mat, lemon_logix, Rhiannon, A-la-N, ishai, Endy, Olgabelokur has marked this note useful

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Additional Photos by Vic Tokarski (kaychambers) Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 270 W: 17 N: 238] (1198)
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