It is easy to give attractive one blue aspect in a steel room.

It is necessary:

-plumber's small blowtorch.

You have to make a point of stoking (see video), when the metal begins to change color you have to move forward.

Do not stay too long in one place, if you are too warm, the metal will go through the blue, but gray back.
Once it begins to change color, you must move quietly.

You just have to spend a little bit of polish on top.

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