When something is ingrained, it’s "deeply rooted" or "firmly fixed," pertaining to qualities, dispositions, or habits. This figurative use of the word ingrain came into English in the 1850s, but its original sense is from the 1300s and had to do with the dried and pulverized insects used to make a color. In this episode, I share all the colors whose names come from the animals whose bodies we crushed or from whom we extracted secretions to make dyes, colors, and pigments.