I don't know that this is particularly relevant but I'll mention it anyway...
A while ago I got some IN-18s and they turned out to have really bad cathode poisoning. I used the overcurrent method to repair them. They were poisoned badly so I ran the current up pretty damn high (20mA I think) for several hours. They cleaned up and worked fine after that, BUT: for about the first 100 hours of normal (4mA) operation after repair they had major purple haze. The haze faded away, the tubes are still working fine over a year later and the color is proper orange with no purple or blue.
Look into it later when the dust is clearing off the crater.
Just to give an update, it seems the majority of the "pink haze" in my tubes faded away pretty quickly. They reached a more orange color profile like I was expecting after probably only an hour or two of operation.