According to GlobalPost, the best way to make the color tan is to combine yellow and brown until the desired shade of tan is achieved. Combining orange and blue or red and green also achieves a tan color.
There are a few other ways to make the color tan. Mixing red and yellow with a tiny amount of blue can also result in the color tan. The process takes patience because tan is neither a secondary nor a primary color. When combining the colors, add the lighter color slowly and at intervals so that the color does not come out too light.