Basics of Photography: Lumenprints, ...I know, everybody make it, but ....

Everytime, when I need my efforts to an important job, I get a lot of other ideas and inspirations...
Do you know this?
This time I've seen videos about Lumen-Prints.
Analoge photography on light-sensitive photo-papier without chemicals?
Wow, what colors, what posibilities. So I took 3 of my old 9 x 12 cm - Cameras and start in the middle of night with Lumen-Photography.

Camera & Object (with day-light)

The problem: it was impossible to find the right field of sharpness on the screen. It was really too dark... But I didn't like to wait, and wanted to go to bed.
I hoped to get some marvellouse Lumen-Prints when I get up at high noon...
This was the theory...

But what I've got, was that:

Lumenprint on photo-paper, exposing time about 7 hrs.

Ok.
It is the negative, but where are the colors?
Later, I find out, that the colors are on this black/white-photo-paper, but only very, very light.
The next step was, to make some digitally "remasterings".

The same Lumenprint, after the digital-process.

Now I take a new photo on usually light-sensitive foto-paper, in the daylight, exposure-time = 40 minutes.

Lumenprint, 40 min. after fixing (yes, with chemicals) and additional exposing with UV-light.

To protect the negatives, I fix them with usually foto-fixer. Then I rocognized, that they became more contrast, when they are laying in day-light (UV-light), after fixing.