What's the color ink that doesn't photocopy well?

[Robb]

Is it red? :shrug:

[newscott]

1. Red, some blues even green.

[Coyote_Bandit]

2. Most common is a light blue

you can buy light blue copy pencils at office supply stores that allow you to mark up documents - and make photocopies that do not show the markings.

[tuvor]

3. Light blue.

You can buy blue pencils specifically for that reason.

Newspapers used to be pasted up on blue-lined paper, too.

[NYC]

6. I have a non-photocopy pencil. It's a pale turquoise.

Eagle Prismacolor non-photo blue 919.

[benburch]

4. Many modern photocopiers are panchromatic.

And will copy most anything.

[SOteric]

5. A kind of 'baby blue'

Pencils of this colour are sold in office supply stores under the name 'NonRepro Blue.'