Current location - Training Enrollment Network - Mathematics courses - Do you use vanishing pens for the concave-convex copybooks in the sixth grade?
Do you use vanishing pens for the concave-convex copybooks in the sixth grade?
number

Our ordinary pens leave marks after writing. And it is not easy to remove. Therefore, if we write on the groove copybook with an ordinary pen, the handwriting of the pen will certainly not disappear. If you want one that disappears after writing, you need to choose a special refill to write, and it will disappear automatically after writing for a period of time.