--dt-spectrum-1 to -6, on light: the 500 steps
spectrum-1red-500
spectrum-2amber-500
spectrum-3green-500
spectrum-4cyan-500
spectrum-5blue-500
spectrum-6magenta-500
inside .dark: the 400 steps
spectrum-1red-400
spectrum-2amber-400
spectrum-3green-400
spectrum-4cyan-400
spectrum-5blue-400
spectrum-6magenta-400
Read by the voice border's tone="spectrum". They follow no brand and say nothing about status, so never use one for success or danger. The primitives are --dt-color-spectrum-<hue>-400 and -500.