Oil-based inks are printing inks made primarily from pigments suspended in oil, typically derived from plants or petroleum. These inks are known for their rich colors and durability, making them suitable for various printing methods, including offset printing and letterpress. One of the key characteristics of oil-based inks is their slow drying time, which allows for better blending and layering of colors. However, this can also lead to longer production times. They are often used in high-quality printing applications, such as fine art prints and packaging, where vibrant colors and longevity are essential.