Clear Ink

Yesterday I bought a cute cheapie rollerball that was by a cash
register. I thought it was kind of cool that it wrote with clear ink
from its transparent ink chamber. The ink comes out the color of the
cap, which in this case was purple. It also comes in blue and pink.
It's the Uni-ball Fusion.

Does anybody know how the ink works? Is there a filter that changes the
ink color before it comes out of the nib? Chemicals? Magic? Any other
ideas?

Nancy

"Nancy Handy" wrote in message
...
Does anybody know how the ink works? Is there a filter that changes the
ink color before it comes out of the nib? Chemicals? Magic? Any other
ideas?

I just assumed it is some sort of chemical that reacts with oxygen...though
magic seems much more reasonable :-)
Richard

"Nancy Handy" wrote in message
...

Yesterday I bought a cute cheapie rollerball that was by a cash
register. I thought it was kind of cool that it wrote with clear ink
from its transparent ink chamber. The ink comes out the color of the
cap, which in this case was purple. It also comes in blue and pink.
It's the Uni-ball Fusion.

Does anybody know how the ink works? Is there a filter that changes the
ink color before it comes out of the nib? Chemicals? Magic? Any other
ideas?

Nancy

I've got one of those, somewhere. I'm fairly certain that it's a colorizing
filter, or a solid-dye chamber that the ink has to pass through, as an o2
chemical reaction would take at least SOME time to occur (i.e., not five
minutes, but it wouldn't be instant) and the ink seems to be purple when it
hits the page.
~14:30

marlinspike wrote:

"Nancy Handy" wrote in message
Does anybody know how the ink works? Is there a filter that changes the
ink color before it comes out of the nib? Chemicals? Magic? Any other
ideas?

I just assumed it is some sort of chemical that reacts with oxygen...though
magic seems much more reasonable :-)
Richard

I'm kind of stuck on the "magic" explanation too.
I'll bet David Blaine uses a clear ink pen that turns colors! ; )

Nancy