Heating a nail white hot (NCPQ)

As a steel nail is heated its colour goes from dull red through to white as higher energy photons from the blue spectral region are emitted. The temperature at the tip of the blue in a Bunsen flame is about 1500 degrees C. As it cools the steel goes from white to yellow to red. In the second video a knife is heated to about 3000 degrees in an oxy-acetylene flame and a bright white colour is produced. As it cools it also goes from white to yellow to red. I gratefully acknowledge the producers of the YouTube channel "Beyond the Press" (https://www.youtube.com/watch?v=C8oaQFUdAqo). Reference: New Century Physics for Queensland, Units 3 & 4, 3rd Ed, December 2018. Oxford University Press. See Section 11.2 page 305. Filmed at Moreton Bay College, Brisbane, by Dr Richard Walding, author of New Century Physics for Queensland, 3rd ed, 2019. Oxford University Press. Website: seniorphysics.com/ncpq