This would be a must have book for the classroom. Color on Metal shows work from 50 artists and also has the artist talking about why they like to add color, how they add color, and so on. I have noticed that a lot a beginning level metals students love to add color to their work, this book shows different techniques to accomplish that as well as large illustrations to show the results. They show the traditional ways like patinas as well as newer ideas like waxes and Prisma colors (which is easy and cleaner then most ways).