One way is to use the method described at https://developers.google.com/chart/interactive/docs/customizing_charts and to create your own palette in the graph's options. Google's default palette is at https://github.com/ankane/chartkick/issues/351, you can simply paste the values into the option and remove the ones that are giving your users problems.
You can completely change the palette using this method to one of the colorblind friendly palettes. There's some available in the dropdowns at http://tools.medialab.sciences-po.fr/iwanthue/ Depending on your data, you can use a smaller palette. Like Google's default palette what happens is if there is more data than colors, then the colors are reused starting from the beginning. This is more less what I did to create the palettes at https://www.indstate.edu/business/metrics Ray -- You received this message because you are subscribed to the Google Groups "Google Visualization API" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-visualization-api+unsubscr...@googlegroups.com. To post to this group, send email to google-visualization-api@googlegroups.com. Visit this group at https://groups.google.com/group/google-visualization-api. To view this discussion on the web visit https://groups.google.com/d/msgid/google-visualization-api/2cbcd555-2b98-43c9-9e9d-c336db62a464%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
