Anything above about 85F darkens the oil, so if you want blond material, may I suggest cold boiling in a vacuum?
All other things being equal, darker material still smells, taste, and effect the same as lighter colored material, so how much effort you are willing to put into it for appearance is a personal call.
As far as ruining it, define ruin? The standards are different depending on end use.
I infer that you are looking for dabbing oil, not an oral, so you will want to remove the alcohol with the least amount of heat possible, and the suggestion of a fan is a good one, with the caveat that in humid climates, if you blow directly across the pool of alcohol, the hygroscopic alcohol will pick up additional water and you will end up with tan colored water after reaching the azeotropic balance point between the water and alcohol.
We like to remove alcohol for dabbables by cold boiling it away under -29.5" Hg vacuum. At that vacuum level, the ethanol boils at -8C/17.6F and leaves a light colored extract.
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