Just out of interest, did you see the green curtain effect, and were there any reddish areas, with your 1.5 observations?
Which is probably, nearer to the truth, would you say. 😉 😉
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The last time I saw it (11 years ago), it was whiteish-blueish-greenish.
A very technical description.:D
I was out walking the basset, I could ask him what he saw, but he’s colour blind.
The other times…30 or so years ago, it was more white/blue. I don’t recall much, if any, red.