Bangladesh Bank has requested all concerned to refrain from writing on currency notes as it causes financial loss to its bearer, destroys security features and wears out the notes. The BB in a release yesterday said it noticed different types of writing, including mobile phone numbers, on currency notes.

Such writing destroys the notes' security features like water marks, dots, invisible printings, iridescent stripes, security thread and microprint, added the release.

In turn, it becomes impossible to determine whether a note is genuine or fake. It also makes the bearer uncertain about the note's exchange value.