Knack to generate a black background

I have no idea if this is of interest or not. Anyway I am going to describe. Not least because this ploy helps me to avoid redundant Photoshop operations.

With every shot I'm trying to take pictures with a background which is as black as possible and a shell which is as bright as possible. Unfortunately, the background is always illuminated and therefore appears gray and not black. It does not matter which (black) material I use - whether Molton, cardboard or glass, everything fades to gray. There had to be a solution, which looks finally like this:

I place the spots...

take a trash bin with a centered threaded rod...

some magnetic fitting pieces...

and pick a suitable attachment...

for the shell.

Then I make the shots...

sometimes with reflector...

sometimes without reflector...

it depends.

» Kind regards to Adam!