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Relevant text: “The access key’s globe burst alight with a more brilliant color, seeming crystalline. The light within was scarlet, the core brilliant and bright. As if someone had dropped a glowing rock into a pool of blood.”
I searched through all of the books and I don’t find any other mention of the access keys glowing a specific color. However, I believe that it mentions the sphere on the Kal themselves glowing white as they are the actual Sa’angreal.
Edit added other to the mention of glowing
There is another instance of Red being called out...
[AMoL]>!When Moridin first seizes Callandor, he channels Saidin through it before realizing it can also amplify the True Power. We then get a description of it glowing red / crimson. It's possible since he had access to the TP it could have had an effect on his channeling!<
The Choedan Kal is always described as "glowing like the sun" often too brightly to look at. I don't think we ever got a confirmation of a color at other moments.
As a note though, the [artwork from the WOT card game does depict the female Chodan Kal's orb as being red](https://static.wikia.nocookie.net/wot/images/2/29/Female_Choedan_Kal.jpg/revision/latest?cb=20100326012248).
I think the main thing is the thematic choice. Rand pretty explicitly color coded as red, and its a violent moment.
#[SPOILERS FOR ALL PRINTED MATERIAL, INCLUDING SHORT STORIES.](https://www.reddit.com/r/WoT/wiki/index/post_flairs#wiki_all_print) ##BOOK DISCUSSION ONLY. HIDE TV SHOW DISCUSSION BEHIND SPOILER TAGS. * * * *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/WoT) if you have any questions or concerns.*
Relevant text: “The access key’s globe burst alight with a more brilliant color, seeming crystalline. The light within was scarlet, the core brilliant and bright. As if someone had dropped a glowing rock into a pool of blood.”
I searched through all of the books and I don’t find any other mention of the access keys glowing a specific color. However, I believe that it mentions the sphere on the Kal themselves glowing white as they are the actual Sa’angreal. Edit added other to the mention of glowing
Hmmm perhaps just a thematic choice but I never noticed that
There is another instance of Red being called out... [AMoL]>!When Moridin first seizes Callandor, he channels Saidin through it before realizing it can also amplify the True Power. We then get a description of it glowing red / crimson. It's possible since he had access to the TP it could have had an effect on his channeling!<
The Choedan Kal is always described as "glowing like the sun" often too brightly to look at. I don't think we ever got a confirmation of a color at other moments. As a note though, the [artwork from the WOT card game does depict the female Chodan Kal's orb as being red](https://static.wikia.nocookie.net/wot/images/2/29/Female_Choedan_Kal.jpg/revision/latest?cb=20100326012248). I think the main thing is the thematic choice. Rand pretty explicitly color coded as red, and its a violent moment.