If those are heat lines (which they look like to me) you are probably screwed... if it's something else you may have a snowballs chance... the only way to be sure is to hone
If it got hot enough to change to that color, it got hot enough to ruin the heat treating of the blade (two stage process involving first hardening, then tempering, or drawing as some say) .... anyway long story short is that if it was a heat problem I believe you are screwed.
Only one way to find out... ever honed before?:D