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it's the anti-halation dye added to the back of the film intended to increase contrast by stopping light been reflected back from / by the substrate. In some films it forms a dark red cloud when combined with the thiosulphate in the fixer.
Hmm - why does it not come off in the pre-soak (if you use one) or in the developer? I use a pre-soak (water with a couple of drops of wetting agent) and am quite used to seeing that being dirty grey when poured out. But the reason for the pre-soak is to ensure that the developer acts evenly without having to agitate too much, which can spoil the acutance properties of the soup.
Is there a bit of emulsion under a sticky label (used to attach the spool perhaps) which is only getting wet at the end of the process?
Well the Google bots have been on the forum, I just googled for it and got my own post as item 3. Looking around it seems to have cropped up on several forums over the years. General opinion seems to be depending on film type some are water soluble and will start to disolve in a pre wash, others need the fixer to form a soluble compound and hence only wash out in the final wash. You could take a leader from several types of film and process in daylight and compare when either the liquid tinges red/brown of when the film base stops been pinkish.
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Re: After developing, pink die came off the film ?