chroma.scale(['#f00', '#ff0', '#0f0', '#0ff', '#00f', '#f0f', '#f00']).mode('lab').colors(9).slice(0, 8).map(c => [chroma(c).darken(), chroma(c)]).flat()
['#c20000', '#ff0000', '#c7a000', '#ffd100', '#78cb00', '#aeff00', '#00ca32', '#3aff65', '#00cbcc', '#00ffff', '#0030cb', '#485aff', '#7300ca', '#ab00ff', '#c70091', '#ff00c2']