Choosing a fragrance from all the fragrances out there is a big choice! There are sooooo many good ones =) One important factor to consider is fragrance discoloration. Some fragrance oils change the color of soap due to various components within the oil. The most common type of fragrance discoloration is vanilla discoloration, which changes the soap to a deep brown. Fragrance oils can also turn soap various shades of yellow, tan, and orange. Fragrance oil discoloration can dramatically change the colors created in soap, so it’s important to choose your fragrance oil (FO) wisely.
Vanilla discoloration is a natural occurrence. Fragrances containing vanilla notes are created with a component called vanillin, which is the primary component of the extract of vanilla bean. Vanillin is the organic compound that gives vanilla its flavor, and is widely used in fragrances to impart gourmand sweetness. The chemical nature of vanillin leads it to cause a darkening or browning, especially of white products. This effect also occurs with natural vanilla extract. The higher the level of vanillin within the fragrance oil, the more darkening will occur. Even fragrances with a small amount of vanillin content of .4% (such as Almond Fragrance Oil) will still cause slight discoloration.