- The notebook reflects light well due to the smooth and glossy surface of the paper or the coating applied to it. This coating, often made of materials like clay or starch, helps create a sheen that reflects light evenly, giving the notebook its lustre.
Eraser:
- Unlike notebooks, erasers typically have a matte or rough finish. They are designed to rub against paper to remove marks, so a glossy or slick surface would hinder their effectiveness. Instead, their texture is optimised for friction, which helps in erasing pencil marks effectively.
In summary, the difference in lustre between notebooks and erasers is a result of their intended functions. Notebooks aim to provide a smooth writing surface and enhance legibility, while erasers prioritise practicality and effectiveness in removing marks.