Turtle Star Fill Color Yellow-White Interchanging Color Effect

[DPaul]

This needs some extra tweaking, but it goes some way towards the desired effect.
Paul

from turtle import *
import turtle
turtle.speed(8)
turtle.setpos(0,0)
color("red", "yellow")
begin_fill()
 
while True:
    forward(400)
    left(170)
    if abs(pos()) < 1:
        break
end_fill()

color("red","white")
turtle.setpos(100,10)
begin_fill()
counter = 0
while True:
    counter += 1
    forward(200)
    left(170)
    if counter == 18:
        break
    
end_fill()
hideturtle()
done()