Finally have taken more colour comparison photos. Sorry again for the slow reply.
M - thanks for your comments and the link to Anne's photo. On my paperweight it is the central region around the bubbles which changes colour. The colour change is subtle. To my naked eye it looks soft pink in daylight but in the right-hand daylight photo the difference is very subtle - just slightly more pinky/heather coloured. I'd be interested in your view and that of lustrousstone as I've not had any neodymium glass before (and maybe still don't
). I wish I had a strongly coloured neodymium piece to compare it with. I'm going to be on the look-out for one in my future purchases. I've read that Caithness used neodymium tints so maybe I can get hold of a Caithness neodymium weight to use as an optical standard?
Anyway, I'll be interested in comments on the photo below.
Happy New Year!