Can't change the colour of Tk button text

[Larz60+]

I tried it, and indeed it does work.
if you need it in a file to try, create a file named trycolor.py
and place this code in the file:

trycolor.py:

import tkinter

root = tkinter.Tk()
xx = tkinter.Button(root, text='Hello', bg="white", fg="blue")
xx.pack()
root.mainloop()

Then run it (from command line) using:

python trycolor.py