Pie chart formal color scheme

Quick answer：

A formal color scheme for pie charts typically involves a set of colors that are easy to distinguish from one another, ensuring that each segment of the chart is clearly identifiable. This is important for data visualization purposes, especially when presenting complex or detailed information. Common practices include using a combination of contrasting colors, avoiding too many colors that may be visually overwhelming, and sometimes adhering to a specific color palette that is recognized and accepted within a particular field or industry.