scp-fs2open
Weapons get a purple tint applied to them in the weapon selection screen after this last update
As you can see the maxim cannon is usually white but now it's purple, another example would be on the fins of the tornado missile
@qazwsxal or @EatThePath might be able to say more, but I'm pretty sure this is an intentional changes to the tech room to have some slight red and blue accent lights.
Historically the tech room, and other views like it such as these these previews has had a single purely white light directly overhead of the object. This is not a good lighting setup, and as assets increasingly include normal maps and PBR materials which depend heavily on lighting to look their best the difference between it and well made level lighting has gotten more and more glaring.
Because of this, and with input from some of the community's more active 3d artists, when the last graphics overhaul went in I also included a revision to this lighting setup as @Baezon said. It is a three light setup, the main light is very slightly orange-yellow, the secondary light is a slightly dimmer light-blue, and the fainter tertiary light is colorless.
I'm not sure that fully accounts for the difference you're seeing here, though it'll certainly be part of it.
Another likely factor, in the past 3d models have been rendered with a default enviromental map(what you see in the reflections on the shiny surfaces) that is a generic green nebula. I believe the handling of that was changed, which was more @qazwsxal's department than mine so I'm not sure what the exact changes were. But if there is no envmap currently, or the level's envmap is being used, that could make a lot of the difference, as this appears to be an extremely shiny model.
With our hodgepodge of assets and rendering contexts spanning multiple pipeline eras, 'intended' is next to impossible to pin down. But I'll try to get some second opinions on this as soon as is practical.
As the designer of this particular model, I can tell you that is not how it's supposed to look. It's shaded an entirely different color than it used to be.
