Arista ortho film, which side is the emulsion

Just haven't done this in awhile, and I have limited film for the project. Under my dim red lights, one side can be considered "lighter" and the other "darker." Can't tell by surface reflection like with Kodak. Help! My chems are set up and ready to go!

The lighter side.

Got it. I was contacting an enlarged lith film, and I went gaa, it's backwards, I must have had the emulsion down! Plus it took a long development . . .but it's supposed to be inverted.