Is the color of each bar customizable? In effect, six colors for example

Yep, as mentioned above, the color array specifies the color of each dataset. So in order to get six different coloured bars, you would need to define six different datasets.

Can the array of colors be supported by bar charts? A select color for each bar

Yes, for the bar charts, the color array corresponds to each given dataset: bar({ data: [ { name: "Category 1", "Dataset 1": 423, "Dataset 2": 0, "Dataset 3": 0 }, { name: "Category 2", "Dataset 1": 0, "Dataset 2": 350, "Dataset 3": 0 }, { name: "Category 3", "Dataset 1": 0, "Dataset 2": 0, "Dataset 3": 20 } ], // color array copied from https://observablehq.com/@makio135/give-me-colors // patterns by RJ Andrews https://github.com/infowetrust/albumcolors colorScheme: [patterns[3], "#FC9D9A", "#F9CDAD", "#C8C8A9", "#83AF9B"], pattern: true })

Thanks Christoph