Society of Asian Scientist and Engineers

We will be explaining the chemistry (acid/bases) behind invisible inks. Kids will write messages to their friends or family, and we'll show them how to reveal the invisible messages. The invisible ink will be dilute laundry detergent, milk, or soapy water. They'll write the messages using a paintbrush or cotton bud, and optionally add a "cover up" message using regular pen. Then we'll show reveal the invisible message by shining ultraviolet light on the paper, or by spraying a basic solution.