when is yellow good to use for control charts? are yellow and green the same color what color is yellow in a control chart what is the color range of a shewhart style control chart where do we go for yellow? what color are shewhart charts what color should a shewhart chart be where to use yellow and green in shewhart control charts what color is a control chart which chart is yellow? what is green which color zone of control is yellow why are we only allowed to control yellow on shewhart charts what is yellow zone in shewhart chart? what is the color coding for shewhart charts what color code for shewhart control what color is yellow what color is standard on a control chart which color is yellow in the shewhart control chart what color is used in a shewhart style control chart what is yellow control chart