Apparently my wife was logged in when I originally posted this thread, anyway, I had read both on here & in a number of sites online that leaving the domino in bleach for between 4 - 24 hours should de-glaze it & remove the need to sand the domino before stamping it or decorating it in other ways.  Unfortunately I just could not get it to work.  I have the feeling I'm missing something, but just can't seem to figure out what it was.