Re: Blood Sugar Tatoo! Home › Forums › Blood Sugar Tatoo! › Re: Blood Sugar Tatoo! 27 January, 2011 at 1:16 pm #8040 AnonymousInactive To add to the encyclopedic knowledge that is ShootUp, there is a “simple” explanation from wikipedia. Honestly!! http://simple.wikipedia.org/wiki/Color_blindness I look at the standard Ishihara test and is reminiscent of someone trying to diffuse a bomb for the 1st time without any training! Fortunately it does not look like my 2 boys are heading that way..