It's weird. My da gave me his old unmarked paints (I assume GW citadel, but never sure), and they must be at least 30 years old, fae the late 80s I guess. They work great so I assume are made with a mix of uranium, poison and toxic lead 😅 I have my own citadel paints fae the 90s and early washes that are still good. Almost everything I bought in the naughties though citadel GW wise has solidified except a few of the older ones in the hexagonal pots with white plastic flip lid. Different mixes mibbies 🤷🏼‍♂️