EXPERIMENT: SECRET MESSAGE WITH INVISIBLE INK
The students did a new experiment. We had to squeeze the juice from a lemon and, with the help of a stick, we wrote a message on a piece of paper.
Later, when it was dry, we brought heat to the paper and ... uala! The message, which until now was invisible, has turned brown and we were able to read it perfectly.
With this experiment we talked about the different fruits that have acidic liquid, the oxidation of elements ...
Later, when it was dry, we brought heat to the paper and ... uala! The message, which until now was invisible, has turned brown and we were able to read it perfectly.
With this experiment we talked about the different fruits that have acidic liquid, the oxidation of elements ...