色 sè
“color, tint, hue, shade; form, body; beauty, desire for beauty; Kangxi radical 139”
On its own, an ordinary character; Cantonese sik1. Readings and gloss from the Unicode Unihan database.
Carries Caesium
Not a plain transliteration: the component was chosen for its meaning, or the name is older than the system.
The element keeps the component’s reading exactly.