code: def toXML(self, writer, ttFont, index=None):
      writer.simpletag("color", value=self.hex(), index=index)
      writer.newline()
  
imports: from fontTools.misc.textTools import bytesjoin, safeEval
  from .None import DefaultTable
  import array
  from collections import namedtuple
  import struct
  import sys
label_desc: Use image node_id 3 for calling the Color obj's underlying member method code with example usage: obj.toXML(writer, ttFont, index) without return types