@property
    def _color(self):
        rPr = self._element.rPr
        if rPr is None:
            return None
        return rPr.color
Return `w:rPr/w:color` or |None| if not present. Helper to factor out
dataset/ETHPy150Open python-openxml/python-docx/docx/dml/color.py/ColorFormat._color