Citadel Paints are all named with some kind of reference to a Games Workshop property. This website aims to collect every single reference in the range, and inform you, the reader, of this. This information is not presented in an academic manner, I don't have the patience to do all 259 paints in a purely serious tone - links are provide for further reading if you are so interested.
Where concepts are found the first time, they will be briefly explained, just in case someone has this as their intro to Warhammer Lore.
As a quick primer, there are three main properties in Games Workshop's repertoire.
Warhammer 40,000, better known as 40K, is set in the titular year, in a future where the galaxy is attempting to eat itself from the inside and humanity has been falling into decline for millenia.
Warhammer Fantasy Battle is a now-unsupported Fantasy Wargame in a typical fantasy setting slowly getting destroyed by the encroaching evil force of Chaos. Eventually, the End Times came, causing the game to cease publication and leading plot-wise directly into...
Age of Sigmar is a High/Mythic Fantasy Wargame following mortals across the Eight Mortal Realms, in a similar manner to the worlds of Norse Myth. The surviving gods from the World-That-Was repeat their same fight, now attempting to banish - or at least resist - Chaos for good.
Paints are ordered here in the same order that they are on the Citadel Colour website: Base Colours, Shades, Layers, Dry Paints, Contrast Paints, Technical Paints and Air & Spray Paints.