Which drying oil generally dries faster but darkens upon light exposure?

Linseed oil is known for drying relatively quickly compared to other oils, making it a popular choice in painting and finishing applications. It is derived from the seeds of the flax plant and contains a high level of unsaturated fatty acids, which polymerize upon exposure to air, allowing the oil to harden or dry effectively.

One significant characteristic of linseed oil is its tendency to darken over time, particularly when exposed to light. This darkening is due to the oxidation and polymerization processes that take place once the oil is applied. While this can enhance the depth and richness of the color of the finish, it is an important factor to consider in applications where a lighter appearance is desired over time.

In contrast, other oils like safflower oil and olive oil generally have slower drying rates and do not exhibit the same degree of darkening upon light exposure. Flaxseed oil, while similar to linseed oil, is often more recognized for its use in culinary applications rather than in painting, despite containing some of the same properties. Understanding these properties helps contractors choose the appropriate oil for their specific needs in painting and finishing.