Half a croissant, on a plate, with a sign in front of it saying '50c'
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Expensive, difficult, slightly dangerous, not particularly effective... I'm on a roll.

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Pencil stamper

When you want something less permanent than ink
  [vote for,

This would work in a similar fashion to usual ink pad stampers, although instead of the pad being an ink-soaked sponge it would be impregnated with powdered pencil lead. You would just push the stamp into the pad, the lead would stick onto it, and stamp away. I don't really know what application this would have, but I thought it was a good idea.
Rubi, Nov 15 2003

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       would charcoal work for you?
po, Nov 15 2003

       I'm thinking you're going to need at least a little relative motion to make this work.
phoenix, Nov 15 2003

       Powdered graphite would probably work ok. It might be tough to "ink" the stamp without making a cloud of graphite.   

       As [phoenix]'s annotation brings up, the graphite might transfer to the paper well enough, but it would just be sitting on the very surface and be very prone to smudging.   

       I have some graphite drawing sticks that are about 1/4" square in cross section. Maybe rubbing one of those on a rubber stamp might work in lieu of a pad.   

       One possible application would be to allow an artistic "smudge" effect to be applied to a stamped image. Of course, you could probably do some form of that with ink.
half, Nov 15 2003

       invisible ink?
po, Nov 15 2003

       This should be done with a mix of iron powder and carbon, kept in an ink jar which automatically evacuates itself of air after closing. You would stamp the powder on, then it would oxidize, burning the marks into the paper. Cutting the mix with silica would adjust burn time: "Satan" strength would smoke and fume immediately after stamping. "Slow burn" would gradually etch its way into the paper over the course of the day.
bungston, Nov 15 2003

       Relating to the cloud of graphite dust, you could mix it with water?
my-nep, Nov 15 2003

       Easy enough to do - rather than graphite, just use the same kind of ink as erasible ball-points. Still trying to figure out why you might possibly want to do it.
DrCurry, Nov 16 2003

       I thought of the erasable ink as well, but doesn't it eventually become permanent (non-erasable anyway)? I'm still trying to figure out if there's a good use for this, too.
half, Nov 16 2003

Disappearing ink?
half, Nov 16 2003

       this is completely baked. In the past graphite stamp pads were used in the college bookstore business to price textbooks. if the price changed before the book was sold or the book was returned to the publisher, we simply erased the price from inside the front cover. It was a bit messy, but it was fast and it worked. Everyone has gone to pricing guns nowadays.
rmtmaine, Jun 08 2004


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