Which process involved exposing and developing negatives while they were still moist?

Wet collodion negative

Explanation:

Known as a wet process because the glass negative required sensitising, exposing and processing while the chemicals were still damp, it required considerable manipulative skill, but produced a negative of unsurpassed sharpness and a broad tonal range.

what painting? ? i would totally you out man. but sadly, i don't know what you're talking about.

sorry bro : /