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Hardiness Zone: 5b
Thanks for reading,
Dee49 from PA
Leaves contain a flavonoid called Anthocyanin, which functions to provide the colors we see in flowers and fruit. In some plants, it is also thought to protect leaves from ultraviolet radiation. (In other plants, it's thought to repel browsing herbivores!) Leaves also contain carotenoids called Xanthophylls. These also help absorb and dissipate any damaging excess light energy that cannot be harvested by the leave's chloroplasts and turned into food.
The red leaves on your cactus are an indicator that it has suffered sunburn. This could be from sudden exposure to excess light, or due to the fact that it lacks the nutrients necessary to help filter out the damaging ultraviolet light.
Check to see that it isn't pot bound, which can effect the root's ability to take up nutrients. As long as it's not pot bound, a boost of fertilizer will probably be enough to turn the leaves back to green again.
i do believe that is your bloom.
I think the red leaves on your Christmas Catus is sunburn. I have mine in the south window, in the winter the sun is hot and the leaves get red. In the winter time they get green again.I think they are pretty that way.
I also have noticed red ends on my Christmas cactus plant that I have outside now on my deck. I've never seen this before and have been wondering what it might be.
On mine, the new leaves are red and then turn green. Also, could be the blooms although I think you would know a bloom.