Our final experiment for Smelly Science was to make scratch and sniff cards! We used three different scents. We used lemon, lime and grape.
our official test strips. 
Kaden's scratch and sniff artwork
Justin's scratch and sniff art work
testing it out
It really does smell!We were able to detect each scent. The strongest? Lime!
How does it work? When you scratch a scratch and sniff card. Your fingernail breaks open the little crystals releasing the scent into the air.
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