A Midsummer Night's Dream 2.1.84 Word Nerd: Purple Grain

The video discusses the use of natural sources for coloring agents, focusing on a red dye made from insects on cactus plants in Central America. This dye, known as 'purple in grain', was valued for its durability, leading to the term 'ingrain'. Over time, 'ingrained' evolved to describe anything fixed or long-lasting.

Why was the dye made from the insect highly valued?

What modern word is derived from the term 'ingrain' and what does it signify?