Indeed the discussion of colour recognition has been very interesting. I
hope the off-shore subscribers have appreciated the spelling!
An interesting web site
http://www.naturfotograf.com/nrfotobj.html
has been brought to my attention, that features UV and IR photography.
Flowers are featured on a sub-page of this site at:
http://www.naturfotograf.com/UV_flowers_list.html#top
Check it out!