During Printing of banknotes, because of various human or machine mistakes some notes or entire batch is misprinted, partly damaged or has some type of error. In the quality control process, though mostly all error notes are scanned, identified and replaced, but then too some skips this screening and come-out in circulation. For an ordinary man it is merely a worry to put it back in circulation to get rid of it or to update banks about these error notes, but a collector is interested to have it in their collection, even if it invites a premium to be spent to acquire.