I have two of these, Freckles and Sunspot and they both open very intensly red then with time the red overlay fades and then you see the yellow underneath. The spots or freckles stay. The flowers are long lasting the red is not.
Flowers that have been open for a differnet amount of time can be different colors. I see this a lot in hybrids with Richard Meuller in the parentage.
I also have a much larger hybrid with Richard Mueller, Tiller Meuller. These large flowers open intensely red and the fade to yellow. Here are pics of newly opened flowers and the a shot of the plant with new and old flowers.