Our thermochromic paper changes color within the temperature range of 31oC (88oF) to 37oC (98oF). As the paper is held in your warm hands, the color will begin to change or disappear. As it cools, it changes back. The cycle repeats itself indefinitely. 8.5" x 11", 75 lb. This heavy weight paper will accept most types of printing including photocopier, laser, ink jet, pen, pencil, etc. The paper can be printed on both sides.
Each package contains four brilliant colors:
- Purple to Pink
- Green to Yellow
- Blue to White
- Magenta to White
Great for bookmarks, secret messages, and papers your students will never lose.