Hi!
Was shoting a simple music video for a competition last week and director showed me some very bizarre filters he found in a storage room at his work. They measured 4' x 3.5' and came in various deep colours like yellow, blue, purple etc. but the key was - the reflections in these filters appeared to have all sorts of colours from blue to green on the yellow filter, magenta on the red etc...
Here is a sample picture taken with the yellow filter at 45 degrees:
If anyone can help to figure out what are these filters, would be amazing :)
Thanks a lot!