Pulsing Castor Jade

The progressive participle of pulse, to throb. Used as a color modifier for hues that read as if they were alternating between two states of luminance — the vibration of a high-saturation color against a contrasting background. Sits in the bright-bucket center alongside electric, with the implication of optical motion rather than static luminance.

Greek Κάστωρ, Gemini-twin-and-horseman. As a color modifier, castor implies a Gemini-twin-and-mortal-brother quality, the visual register of Gemini-Castor-and-Pollux-twin hand-Gemini-twin-and-mortal-brother Gemini-Castor-and-Pollux-twin-and-Argonaut castor-and-Gemini-twin-and-mortal-brother surfaces under Gemini-Castor-and-Pollux-twin-and-Argonaut spring-Gemini-and-Bortle-1-sky stellar-twin-light. Sits at the modifier-and-cosmic end of the grid, parallel to pollux and spica in usage.

Two minerals share the name: nephrite (a calcium-magnesium silicate, dominant in Chinese jade) and jadeite (a sodium-aluminum silicate, dominant in Burmese imperial jade). Both have been carved in China since at least the Neolithic. The color refers to high-quality apple-green jadeite: a saturated, slightly muted yellow-green with the waxy translucency of polished stone. Cooler than apple, warmer than mint, with the millennial cultural weight of yu, the stone of heaven.