I bought a three pack of the FriXion pens a couple of days ago. The colors of the pens that I bought are orange, pink and purple. I played with the to see how well the worked. The orange and pink disappear completely when heated, but the purple does not. I am hoping to get the black FriXion soon. I'll let you know how they work once I know. It is fun to put things in the freezer to bring back the color.