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"Where?" you ask. "I don't see anything."
"That's the point - the image is invisible, doofus."
You don't appreciate being called a doofus, but you step forwards anyway and peer at the apparently empty screen in front of you. You turn around.
"What-"
The question dies in your throat as you realize that [redacted] is gone. With a sigh, you turn to the screen again:
And then the second screen:
Answer
The images hide
two QR codes, using transparency for "white" and white for "black":
They say
see my profileandall the way at the bottom: in Mithrandir's profile there is another link to another QR code.
That one says
http://i.stack.imgur.com/ch3wd.png, which is another link to a QR code.
That one says
http://i.stack.imgur.com/gpaTg.png, which finally isn't a link to a QR code! It's a link to a regular bar code instead.
And that one finally says
Magnesium.
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