Inky impression 7.3” red haze

I just bought the Inky impression 7.3”, ran a few programs on it, and realised it was getting a sort of red haze around the edge. I ran the ‘’ program and it still persists…

Is this normal?

(I do have another image of it, but the forums won’t let me post it!)

I thought this was mentioned in another forum post but I can’t find it. I think that someone replied that the product page mentions this effect:

We’ve noticed that the corners can also sometimes have a pink tinge when displaying full white, especially when the screen is cold.

The effect is quite pronounced in the top-left and bottom-right corners in your photo, but I don’t know if it’s within normal parameters.