If I developed completely unexposed sheet film, would there be the markings of the film on the sheet e.g. the 'HP5 400' that appears at the borders?

Just spent a long time developing 4 sheets and the results were completely blank, with no edge markings...

I'm pretty sure my technique was fine as have had no issues before - only thing I can think of is if I mistakenly picked up unexposed film from the holders with film instead of holders with exposed film.