Ballpoint pens with erasable ink were pioneered by the Paper Mate pen company.[32] The ink formulas of erasable ballpoints have properties similar to rubber cement, allowing the ink to be literally rubbed clean from the writing surface before drying and eventually becoming permanent. By Alphonso Dunn In this video Lehrbuch https://laserskoienje37048.nizarblog.com/22486866/top-jeweils-fünf-ballpoint-pen-drawing-urban-news