Radiant, an elegant theme for Discourse

Oh! I see tertiary is defined in about.json:

  "color_schemes": {
    "radiant": {
      "primary": "000000",
      "tertiary": "3977FF",
      "header_primary": "4d4d4d"
    }
  },

So I assume this must be where it’s getting the color value. But why would it be pulling from this if I don’t have the “radiant” color scheme selected?