Multiple exposures and overlapping exposures do no harm to this fogged and expired high speed film. I’ve found through trial and errant use that this batch of film I bought wants a lot of light to make an image appear. Luckily the Holga is made for multiple exposures and is a blast to shoot without checking any “settings” (which indicate a level of accuracy).
More of my favorite Holga images here
Camera – Holga 120N