>>4237282https://petapixel.com/2015/08/10/how-much-can-you-overexpose-negative-film-have-a-look/#:~:text=6%20Stops%20Overexposed,to%20shoot%20through%20the%20negative.
And from my own experience, the scanner is the problem there, I use a lightbox and dSLR to scan images, even negatives that look completely black to my eye can still pull an image out of them with a long enough exposure, and to very little detriment. This negative was on 35mm and looked black.
