[popo]

Flowers are a problem, not reds in general. Red/purple/blue flowers all can be difficult depending on the kind, due to parts of the invisible spectrum wreaking havoc past the CFA... You can tame "blown out" red in PP, but changed purples and blues are hard to get right again.

I'm not convinced that "invisible spectrum" is the cause here. That can only really be NIR or UV. On an intentionally modified camera (all filters removed other than bayer itself) the UV sensitivity was nothing much to speak of since most normal glass is pretty effective at blocking it anyway. For practical purposes the sensitivity of an unmodified camera is zero. NIR sensitivity is relatively higher but more complex as the typical bayer colour filters vary in their IR wavelength sensitivity, so you can get some interesting false colour images from that. But a standard camera will have a pretty effective IR block filter separate to that. Relative to a scene with visible light, the sensitivity is so low down to be insignificant.

 

Most likely if you're struggling with deep blues/purples in images, then after making sure you're not channel clipping, it is more a colour management in workflow problem.