First track day

Hey guys did my first track day the other week. Wanting to know about the bluing of the rear tyre? I’ve read it’s the oil in them coming to the surface. Wasn’t blue after the track day only now that it’s been sitting for a week on the stands on the bottom of the tyre. Question is does this wreck the tyre or will it make one side work less than the other now that the oil is predominantly on one half? Thanks in advance? Still plenty of life left in them so don’t want to bin if it’s normal. I did use warmers aswell. And had them back on straight after each session so didn’t have a chance to cool down till end of the day