See that thing different!
A Croatian agency developed a material for a report of an annual gastronomic company with something unusual.
Inside the report contained a small book of recipes all in white with the title "Well Done". It possible to read it had to Assa it at 100 ° for about 25 minutes, as the name suggests, then it was "well-baked", 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 the merchant, click here.

You know it reminds me of those cartinhas with secret messages written in lemon juice that we used to do in childhood. Expose the letter was sufficient to heat a candle to the "Secret text" appeared. Very nice ...

Found in Aletp