Invisible pictures

This is a very badly underexposed negative. It is a photo of a good old friend of mine, taken in 1994.
At 1st I thought it was a clear negative. Then I noticed a slight bit of darkening on it so I scanned it.

After planing around with the sliders in Adobe Raw I inverted it to get a positive image. There was/is a lot of vignetting & noise on it. It is also a blurry photo.
Not a great photo by any means.

BUT, since there wasn’t many photos taken at this time it has value. And well worth the trouble to restore it even this far.

So very faded photos & greatly underexposed negatives can be brought back to a visible image.

Please see this video for more details. Sorry only in dutch.