“Well done” is an annual report of the company Podravka and designed by Bruketa & Zinic some years ago. The concept is really nice:

You must bake part of the annual to be able to read the whole content because the book is printed with thermo-reactive inks, so ones it is baked at 100 degrees Celsius during 25 minutes, the heat of the oven, makes the images and text appear.

via fourchetteencarton