a petition launched on monday demanding samantha armytage apologise for ` racist ' remark made last month .
presenter was interviewing mixed race twins lucy and maria aylmer on sunrise .
during introduction she said ` good on ' lucy for getting ` her dad 's fair skin '
video of the interview has popped up on social media and sparked change.org petition .
a seven spokesperson said the comment was sam ` taking a dig at herself '