The 5th day, 2:00 a.m.: Scenery of a kiln place
The flame of drawing in from a spy hole. It occurs, the balance is bad between the amount of the air coming out of the chimney and the amount of the air coming into the kiln from a fire mouth. When you faced like this situation, you should close the chimney a little, or open the fire mouth or the under fire mouth a little.
5:30 a.m.: Flame is visible even if it is becoming bright.