Since the concept of primary colors appears in the 18th century at the earliest, no one could precisely define colors until then. The actual shades of color used can range widely, depending on tastes and circumstances. Thus, the choice of a particular shade is a matter of aesthetics. Those tinctures are pretty much well established. Whether those two are really tinctures is a matter of dispute.
French blazon uses the term carnation for flesh tones, and also refers to the tincture orange .