how can you tell if its remi?

buy some and look under a microscope?

I mean that would work but I don't know how to tell other than other people's reports on various brands without seeing the hair itself.  And you need a good microscope to see.  I haven't ever looked though now I'm going to put my hair under the 'okay' m icroscope and school, then the 'better one.  I can't get away with using the nice one like that...  Now I have a new bizarre hair mission.