I should let you know that the indeed does go down to orange and red, in the same format as health does:
Green = 76-100
Yellow = 51-75
Orange = 26-50
Red = 0-25
By the time the overall durability reaches the orange or red stage, you will be in the "shaped" quality area.
I know you can change the colors of the health stages thru the options window, but I am not sure about the dura for tradeskills.
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