Silk: A World History Aarathi Prasad I have mixed feelings about Aarathi Prasad 's Silk: A World History . It belongs to a nonfiction genre I call "history of substances". Notable books in that genre are Amy Butler Greenfield 's A Perfect Red , which is about cochineal, the red dye that comes from the cochineal bug, and Sophie D. Coe 's The True History of Chocolate . I loved both of those books -- they were as fascinating as novels. I am sorry to say, though, that Silk was less gripping. By the time I reached the end, I was eager to get there. There was one specific problem and some more general ones. Cochineal is a very specific thing -- it comes from the cochineal bug and no other source. That made Greenfield 's job in A Perfect Red circumscribed. Coe likewise had a well-defined job in describing the history of chocolate -- it's a product of the cocoa tree Theobroma cacao . Silk is NOT just one thing. Most of the silk you have ever seen is