what is red biro

A red biro is a type of ballpoint pen that writes in red ink. It is commonly used for writing, drawing, and marking documents. Red pens have traditionally been used by teachers when grading papers to make their comments and markings stand out from the text. However, a study has shown that using red pens by instructors leads to a more negative response from students, who judge the comments more harshly and rate them lower in "bedside manner". The use of red ink is also discouraged in official documents, as there is no statutory law or rule that allows the use of red ink to fill forms or use red ink when blue ink is unavailable or urgent.