They do show very dark bands early in the morning, during the corse of the day these bands get paler and disappear, they then get fainter purplish bands during the day when displaying. Again they can appear quite orange at times other times quite dull in colour. I will have to take some more photos, hopefully better ones with their colour change throughout the day.
If it is any help the only label they had in the LFS was Pigeon Blood Rainbows.
Thanks for all replies
Lace