Multi-colored pens

Some ballpoint pens are made with multiple ink colors that can be selected by the user.
The most common versions of these are the three-color pen, which has black, blue, and red. Bic has made a four-color pen for a long time that also has green ink. Both of these versions work by the user pressing down on a lever, that will lock in place when it is held to the bottom. It can be released by pressing down partway on a lever of another color.
The past generation has seen the introduction of a 10-color ballpoint pen. Most of these work by pressing down on a lever the same way as one would in a three- or four-color pen, but in order to release the color, a button at the top must be pressed.
Colors that are commonly found in 10-color pens are black, blue, brown, green, orange, pink, purple, red, turquoise, and yellow.
One unusual version of the 10-color pen that was sold during the early 90s at the Nature Company stores had scented ink.