There are some workarounds to this problem, but not many of them are as smooth an effortless as this one which uses erasable pen ink to add colors to the filament on the fly. Erasable pen ink is a ...

erasable pens, highlighters or gel pens in your answers. Gel pens can’t be used because they don’t tend to scan well and can make it difficult to read answers. The same goes for blue ink pens ...

Rohtak: Following the massive medical exam scam in which students from three private medical colleges were accused of re-writing their answer sheets using erasable ink pens and textbook ...