I don't think they are a painted or dyed fish. Their colors look pretty natural but I'm a novice so I may be wrong. What is the coloring pattern of the Hyphessobrycon flammeus. The ones labeled in the store as Diamond Von Rio Flame are half yellow and half orange with some light brown horizontal stripping. There are also label orange flame and yellow flame varieties that have similar color intesity (not neon or weird in pattern). And a third that is call a Von Rio Flame that is a little different shape than the diamond and lacks the stripes.
I have seen 'mixed fruit' tetras that are a dyed glass tetra in a different LFS and these aren' t the same. Am I accurate in my assumption that most dyed fish have very bright 'unnatural' colors and are usually not a uniform intensity of color across the entire body (ie the top of the fish has more color than the bottom)?