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Cloudy looking decals or decals where the colour is not bright need to be burned out and carbon monoxide fumes have to be removed from the kiln. Manual venting by propping the lid and removal of peephole plugs will improve the firing, but may not help bring enough air to the bottom of the kiln or to distribute it evenly throughout the load. A downdraft vent system will ensure sufficient air is brought into the kiln and circulated throughout.