That thing looks different!
A Croatian agency developed a material for an annual report of a gastronomic company with something unusual.
Inside the report contained a small cookbook all in white with the title "Well Done". To enable it to read it had to bake it at 100 ° for about 25 minutes, and as the name suggests, then you were "well cooked", revenues were visible! The texts and images were printed with a special ink that reacts to heat.
To follow the sequence of images showing the whole process and obtain the technical data of this merchant, click here .

You know what this reminded me of those little letters with secret messages written in lemon juice we used to do in childhood. It was enough to expose the letter to the heat of a candle that "hidden text" appeared. Very nice ...

Found on Aletp