Printed with special thermo-reactive ink, this “Well Done” book needs to be cooked in an oven before the typography appears. Click here for first picture in gallery.

To be able to cook like Podravka you need to be a precise cook. That is why the small Podravka booklet is printed in invisible, thermo-reactive ink. To be able to reveal Podravka’s secrets you need to cover the small booklet in aluminium foil and bake it at 100 degrees Celsius for 25 minutes

[via Dezeen]

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