[Python] How to make out line color different from fill color in turtle

I am trying to make my "outline color" different from my "fill color" in turtle but any time I add the second argument to color(), which is suppose to be my "fill color", everything just turns black. If I take out the second color, it uses the first color as both the "outline color" and the "fill color":

import turtle

china=turtle.Turtle()

china.color('blue','green')

china.begin_fill()

china.forward(50)
china.left(45)
china.forward(50)
china.left(45)
china.forward(50)
china.left(45)
china.forward(50)
china.left(45)
china.forward(50)
china.left(45)
china.forward(50)
china.left(45)
china.forward(50)
china.left(45)
china.forward(50)
china.end_fill()

turtle.done()


The code above gives me a totally black "outline color" and "fill color" why? Why not a blue "outline color" and green "fill color"?

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