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In their spectacular chemistry experiments they tried replacing the nasty perchlorates and barium with a strontium nitrate, potassium periodate or sodium periodate instead; all of which have less toxicity issues.

The periodate salts may garner widespread use in military and civilian fireworks because of their low hygroscopicities and high chemical reactivities.

Periodate salts, if used in correct proportions, could replace the more toxic perchlorates. 

Sodium periodate produced a brilliant yellow white flash that would be perfect for fireworks. 

Iodized potassic An immediate A brown oil crystallizing iodide. precipitate of after a time. periodate.