I see what
@stevesmi is saying.
But something to know is that all color in everything is how the light is absorbed. The double bonds and conjugation in molecules, like tren for example, absorb different wavelengths of light. In other words color does correlate to whats in the vial.
If its changing it has to do with oxidation of those molecules (change in oxidation states, not necessarily from oxygen) or the bonds in the molecules.
Below is light absorption in nm and correlating colors. Been a long time since I messed with this topic in uni - but there's something weird happening. If this is from batches maybe the mfg's can explain. I wouldnt expect large shifts because that indicates breaking or forming of double or triple bonds....
View attachment 159916
old fina kits had some red during the first phase, but never after filtered. I'd be concerned.