Seleucid Argyraspides

Does anyone have any evidence or ideas about the color scheme for Seleucid argyraspides pikemen? As a guard unit I might expect some purple and yellow, but I have seen an argument that they were really nothing more than "full time" Seleucid soldiers (as opposed to the rest of the phalanx, which was only raised when needed) and probably wouldn't have been that different in appearance. Then again, they did have silver shields... or did they? Could this term have been an anachronism, similar to the way tank forces are still called "cavalry"? Does anyone have any ideas?

During the early period of the Wars of the Successors, the Argyraspides were a distinct unit which had silver shields and were veterans of Alexander's army. They fought for Eumenes before switching to Antigonos Monopthalmos.

The Argyraspides in the later Seleucid lists would not be the same men. Bar-Kochva in "The Seleucid Army" and later in "Judas Maccabeus" theorized that they were the sons of the Macedonian settlers, who served as a standing force and the core of the army. The full phalanx was called up as needed. After serving for a few years they would pass to the 'reserve' and be replaced by new recruits.

No idea as to the uniform. If you follow Bar-Kochva's theory then I would do a somewhat uniform appearance. Silver shields wouldn't hurt though!

That's more or less what I thought; thanks for the tip.