rainbow flame fire | interesting experiments of science

How the rainbow flame works
There are safer ways to do the rainbow flame experiment, as the new ACS video illustrates. Instead of pouring methanol into dishes of metal salts, teachers can dissolve the salts in water. Then they leave the ends of wooden sticks in the solution to soak overnight. Those sticks absorb the salty solution. When the teacher (or student) puts the ends of the wooden stick over a bunsen burner — a controlled-flame gas burner used in laboratories — the salts will transform the flame’s color.
It’s just one color at a time instead of a simultaneous rainbow. Still, Chemjobber argues that this version “is more tactile.” It lets people handle the sticks and burn them themselves. The downside: “It’s not as mesmerizing.” But if teachers feel compelled to go for the dramatic full- rainbow effect, he says, they should use a chemical hood, with plenty of protective equipment.
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