What you describe is regular burn-in, but this is not just burn-in. Leaving a static image for >30m has no visible effect on this panel. In this case it's the

What you describe is regular burn-in, but this is not just burn-in. Leaving a static image for >30m has no visible effect on this panel. In this case it's the flicker itself which persists on _top_ of a slight color shift, and requires only a few minutes of exposure. I tried this on another older dell IPS panel and I observed the same. Quite interesting!