If you hold a piece of iron wire with a pair of tongs inside a candle flame or a bunsen burner flame, what will you observe? Will it produce a flame?
Observation of holding a piece of iron wire with a pair of tongs inside a candle flame:
Thus, if we hold a piece of iron wire with a pair of tongs inside the flame of a candle or a bunsen burner, it will turn red without forming flames.