Scanning slides

I have read some of the explanations of scanning slides and the correct way to scan them. I have some that were put together by Kodak that say Kodak Ektachrome and they are shiny on both sides. How does a person tell which side is the front? I have scanned them with the brand name away from the light side or up hoping this was the correcting way? No writing in them just people pictures so hard to tell.