Bit, I have an old and I mean old, fuchsia Christmas cactus that I watch it changing colors as it matures. It starts out as a green cutting. It turns into a light pinkish green stem and it is a S.Truncata also. As it matures the leaves are a beautiful color. Not as deep pink as yours but a beautiful pale pinkish yellow. The stock plant is all green and it is in my bedroom facing South. Gets some late afternoon filtered sun. The starters are in the GH and I too thought it was the excessive light they get and the change in temps. that makes them get pinkish. I will look for a shot of the one that is a few years old and still pinkish. What color are the flowers on your pink lady?
