Safflower Seed Oil in Lotion: Rancidity

Based on your description of the lotion turning yellow and having a strong rancid smell that covers the fragrance, it is highly likely that the Safflower Seed Oil has gone rancid.

Natural oils, including Safflower Seed Oil, contain fatty acids that can oxidize over time, especially when exposed to air, light, and heat. This oxidation process leads to the development of off-colors (like yellowing) and unpleasant odors (rancidity).

Safflower Seed Oil (specifically NaturalProfile™ Safflower Seed Oil (Cold-Pressed)) is suitable for use in lotion formulations and is commonly used in skincare products.

The shelf life of natural oils varies depending on the specific oil and, importantly, how it is stored. Proper storage in a cool, dark place, tightly sealed to minimize exposure to air, can help extend the shelf life. Once an oil has gone rancid, it should not be used in cosmetic formulations as it can potentially cause skin irritation and will negatively impact the product's smell and appearance.

It's recommended to check the quality of the oil itself before incorporating it into a formulation. If the oil smells rancid or has changed color before mixing, it is likely already spoiled.