English: Red is the color of fire: it's warm, it's noticeable. Hot iron forging is as ancient as the iron age of mankind. Perhaps it has survived to the present day, with little change over thousands of years. You can notice the red on the master's face in this photo. It shows you the hotness of the difficult working conditions due to fire. The fire and hot iron make the already narrow space much hotter. In addition the energy and effort spent while working, and the smoky ambient temperature creates difficult working conditions for the master. Despite all odds, on his face you can also see the proud of success.