Mario - To me it's a dream shop. Actually your pics are a treasure trove of
color references for an old machine shop that has seen years of continuing use.
Some observations and thoughts:
1. Machines tended to be painted some shade of gray from the 1930's and back.
Greens got popular in later periods.
2. Note the lathe with a flaking off coat of lighter gray on top of dark gray.
3. The cone pulleys where the smaller high speed diameter that never gets used
has a light rust coating.
4. Gears that are black with a little shine from accumulations of grease
5. Bare metal surfaces have a cast iron gray with a slight shine. Definitely
6. The natural steel gray of tools gets softened by dust and light rust from
disuse, especially if they are stored near the floor.
7. Tools tend to be stacked in an orderly fashion to take up the least space
and be easy to find. Tools scattered uniformly on a workbench top would be an
uncommon sight in a working shop.
8. Steel chip piles in a working shop will tend to be somewhat of a shiny
silver gray. Cast iron chips will be a dull dark gray. Brass chips a subdued
gold color. Cast iron chips will be rare in a maintenance shop. Common in a
production manufacturing shop of the period