Hi Ivo
Those are good places to look, thanks.
My fault as my post was not clear - the vase is cased - it doesn't look like it because of colour flooding, it is the brightest vase I have ever had LOL.

Clear casing to base 2cm, vase weight 900g, it is red when viewed in a normal light, any intense light (flash, direct sunlight) makes it glow an orange
Thanks
Adam P