Oily ink is generally used for oily refills. The ink is thick, and the written handwriting is bright and not easy to smudge. Suitable for writing on smooth paper, such as office supplies, signatures, paintings, etc. However, the ink of oily refill is thick, which is easy to block the refill, needs frequent use and maintenance, and is not easy to erase. If you make a mistake, it may be difficult to use an eraser.
Water-based refills are generally made of water-based ink, which is relatively light and suitable for writing on rough paper, such as notes, drafts and coloring. The ink of water-based refill is easy to dry, not easy to block the refill and easy to erase. If you make a mistake, you can erase it directly with an eraser, which is convenient and practical.
Therefore, oily refills and water-based refills are suitable for different scenes and needs, and which one to use should be selected according to actual needs. If you need to write important documents or signatures, you can choose oily refills; If you need to draw a draft or paint, you can choose a water-based refill.