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ColorBrewer2: https://colorbrewer2.org/
Coolors: https://coolors.co/
MIT Colors
MIT Graphic Identity: https://web.mit.edu/graphicidentity/colors.html
Sloan: https://mitsloan.mit.edu/brand-guidelines/color-imagery
Color contrast checkers:
Coblis Color Blindness Simulator: https://www.color-blindness.com/coblis-color-blindness-simulator/
Colour Contrast Analyser (CCA): https://www.tpgi.com/color-contrast-checker/
Creating custom color palettes in Tableau: https://help.tableau.com/current/pro/desktop/en-us/formatting_create_custom_colors.htm