This is what happens when your shutter gets stuck and you don´t know about it. Result is an EI of between 2 and 5 for a 100 film which can be rated at 200 in Caffenol.
Grain galore, dense negatives, verging on opaque. But I rather like the effect none the less, not a total loss.
Beautiful contrast between the sandpaper grain and those windows. Without the perspective of that rooftop, this would be quite abstract. Nice mistake on the overexposure.