Is there a technical reason unnatural skin tones don't tan?

Perhaps, it has everything to do with how many colors would have to be added? I can't imagine a blue skin tone going brown or red, even. I would think a tanned form of the light blue would be a darker blue and perhaps something more like a shade of purple for a burn? As in red + blue = purple? Same for the other colors. A tanned green skin might be a darker green, but what would it look like burnt? An ugly brownish-green? Charred? Red, blue and Yellow are your primary colors. From these three comes all other colors. If you add red to blue you get purple. The shade depends on how much red you add, also how dark the blue is. Same with adding yellow to red gets you orange. If you add yellow to blue you get green. Black and White aren't truly colors. Black is the absence of color whereas white is the combination of all color. Studying light will instruct on that. If, however, you add white to red, you get various shades of pink. If you add red, blue and yellow together you get an interesting shade of brown. If you add black to white you get various shades of gray. Paint can be fun to mix. :) Yes, I took three years of art in school.

Logistically it was probably impossible. Whether or not the modders can figure a way around it, I can't say.

I don't think it's a technical reason more like trying to be more realistic, I mean i have no idea what tan color for green or paleish blue are, but way before Island Living is a thing, modder named Flerb already made a mod for this, and it can applies to almost every skin including barbie doll skin detail.

"GalacticGal;c-17136130" wrote:
Perhaps, it has everything to do with how many colors would have to be added? I can't imagine a blue skin tone going brown or red, even. I would think a tanned form of the light blue would be a darker blue and perhaps something more like a shade of purple for a burn? As in red + blue = purple? Same for the other colors. A tanned green skin might be a darker green, but what would it look like burnt? An ugly brownish-green? Charred? Red, blue and Yellow are your primary colors. From these three comes all other colors. If you add red to blue you get purple. The shade depends on how much red you add, also how dark the blue is. Same with adding yellow to red gets you orange. If you add yellow to blue you get green. Black and White aren't truly colors. Black is the absence of color whereas white is the combination of all color. Studying light will instruct on that. If, however, you add white to red, you get various shades of pink. If you add red, blue and yellow together you get an interesting shade of brown. If you add black to white you get various shades of gray. Paint can be fun to mix. :) Yes, I took three years of art in school.

Logistically it was probably impossible. Whether or not the modders can figure a way around it, I can't say.

Isn't white the absence of color and black the combination of all colors?

Each tan is custom to the skin colour, so I see nothing wrong with making a darker shade for green, purple, or vampire skin colours. They just didn't want to. It's 'unrealistic' yet there are mermaids in the game. I hope this gets patched.

"floridameerkat;c-17136268" wrote:

"GalacticGal;c-17136130" wrote:
Perhaps, it has everything to do with how many colors would have to be added? I can't imagine a blue skin tone going brown or red, even. I would think a tanned form of the light blue would be a darker blue and perhaps something more like a shade of purple for a burn? As in red + blue = purple? Same for the other colors. A tanned green skin might be a darker green, but what would it look like burnt? An ugly brownish-green? Charred? Red, blue and Yellow are your primary colors. From these three comes all other colors. If you add red to blue you get purple. The shade depends on how much red you add, also how dark the blue is. Same with adding yellow to red gets you orange. If you add yellow to blue you get green. Black and White aren't truly colors. Black is the absence of color whereas white is the combination of all color. Studying light will instruct on that. If, however, you add white to red, you get various shades of pink. If you add red, blue and yellow together you get an interesting shade of brown. If you add black to white you get various shades of gray. Paint can be fun to mix. :) Yes, I took three years of art in school.

Logistically it was probably impossible. Whether or not the modders can figure a way around it, I can't say.

Isn't white the absence of color and black the combination of all colors?

No, you've got that reversed.

No, it's called cutting corners. Basically they couldn't be bothered, as with all the other missing features in this pack.

I remember a guru mentioning why vampires don't tan/burn - because their skin is dead, and therefore it isn't even theoretically possible to do either. Not sure why the rest can't though! Yeah, I don't get that whole white/black thing either - you mix colors, you get black, not white, but okay scientists...

As many gripes as I may have with The Sims 4, this is not one of them (Except for the bit that it stops you from completing an aspiration).
They are unnatural skintones. What says they are like sim/human ones with melanin? Vampires are undead, therefore dead skin. They aint really fans of the sun either. Aliens are, well aliens! Their skin pigmentation can work very different from ours/sims. And plant people are more plant than sim. Plants doesn't tan.

"WildIrishBanshee;c-17136897" wrote:
I remember a guru mentioning why vampires don't tan/burn - because their skin is dead, and therefore it isn't even theoretically possible to do either.

tbh i’m fine with vampires not tanning for lore reasons (though i wish they could moonbathe instead ? raise vampire energy instead of getting a tan), but the vampire skin tones are available to normal sims too. they just didn’t make tans/burns for those skins. same as alien/mermaid skins.

it’s like mermaids not snorkeling. instead of giving them an animation for swimming underwater/near the reefs (minus the snorkeling gear obviously), it just says it’s taboo for mermaids to snorkel.

Half-Aliens can tan and they get a moodlet. However, their skin colour does not change, they still look the same.