physics question #302



Liz Morice, a 16 year old female from the Internet asks on December 13, 1997,

Q:

What makes the aluminum powder in an Etch-A-Sketch stick to the glass to make an image?

viewed 13284 times

the answer

Barry Shell answered on December 13, 1997, A:

The combination of the aluminum powder with a type of microscopic plastic beads (and probably some other secret ingredients) probably forms a mixture that develops an electrostatic charge that keeps it sticking to the glass -- much like when you rub a balloon on your hair and then stick it to the wall. To learn more about Etch-A-Sketch, check out the "Etchy" website.

Add to or comment on this answer using the form below.
(required)
(required if you would like a response)
Note: All submissions are moderated prior to posting.
If you found this answer useful, please consider making a small donation to science.ca.