Here is an online photo of Iolanthe. http://www.biologie.uni-ulm.de/systax/dendrologie/Mag'Iolan'fw.htm Actually the initial color you see in the tree photo is normal but the flowers usually fade to a little lighter pink in most years as they start to nod.
I've seen various photos of this, as well as plants in person. Otherwise I wouldn't have had a basis for comment. P. Smithers wrote an article about it once where he called it "Instant Campbellii", but I think 'Star Wars' is a better candidate for this title.