Definition
Quercitron refers to a type of oak tree, specifically *Quercus velutina*, whose bark yields a yellow dye. This dye was historically used for coloring textiles, especially wool and silk. The tree itself is a black oak, but the term 'quercitron' emphasizes its dyeing properties. It was a significant source of natural yellow dye before synthetic dyes became common. Think of it as the original color filter for clothing!