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Sapphire Fingerprints under microscope

Hello there,
Can someone explain the difference between fingerprint that is unheated and heated? How do you say one from the other while examining under microscope?

Photos would be appreciated and explanation.

Thanks

http://www.lotusgemology.com/index.php/library/inclusion-gallery?filter[gemtype]=Natural+Sapphire&filter[origin]=&filter[enhancement]=&filter[search]=&start=0&layout=gallery