Cactus turning yellowish :(

[gyeongryeonglee]

3F5A4A1A-FE60-4B9B-A955-F96BD0EC1CDD.jpeg (100.1 KiB) Viewed 1378 times

My mum’s cactus is turning yellowish and we haven’t got a clue what’s going on. The right one in the photo is the one we’re concerned about - it was actually the same colour as the one on the left when we first brought it home.

What would you say are the possible cause and a solution? It might be hard to tell just from one photo - please don’t hesitate to let me know if there’s any other information or additional photos needed to find out the cause!

Any help would be greatly appreciated!

[The_Nikon_Guy]

Sometimes a Google serach is all that's required to answer your question. Have a look at this very specific article on why cacti turn yellow.
https://cactusway.com/why-is-my-cactus- ... 20survival.

[anttisepp]

Heat and heavy insolation may provide lightening, usually it appears in plants living indoors after moving them outdoors. Slight shade and watering will probably heal them. They are very sensitive after greenhouse conditions they have been grown. Anyway light skin colour is very typical for this cereus.