Rossi report : the temperature of the outside cylinder is reported to be at 871C max, 820C average.
Shouldn't it be glowing cherry red? http://www.hearth.com/econtent/index.php/wiki/Temperature_when_metal_glows_red/ C F Color 400 752 Red heat, visible in the dark 474 885 Red heat, visible in the twilight 525 975 Red heat, visible in the daylight 581 1077 Red heat, visible in the sunlight 700 1292 Dark red 800 1472 Dull cherry-red 900 1652 Cherry-red 1000 1832 Bright cherry-red 1100 2012 Orange-red