WONDER #1185: How Does Invisible Ink Work?
Question 1 of 3
The simplest invisible inks made from household substances, such as soapy water, are activated by what?
- atomic particles
Question 2 of 3
Today, many amusement parks use invisible inks for hand stamps that are activated by what?
Question 3 of 3
Chemically-activated invisible inks can be made from any two chemicals that are what until mixed with each other?
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