The first years we lived here, on the place up on the bench, I bought and planted red and yellow glads, I took the bulbs up each fall so they would not freeze, split them off and replanted the best ones each spring, on the third year, some bloomed salmon colored. They were so pretty until the jack rabbits ate them all off. They seemed to really love the salmon colored ones best. I brought some of them down to the new place here and they bloomed red, yellow and salmon until the bulbs just gave out.
Another case of changing color in bulbs that I have witnessed.