BHA stands for butylated hydroxyanisole, which is a synthetic antioxidant that is commonly used in perfumery as a stabilizer to prevent the fragrance from degrading over time. Like BHT (butylated hydroxytoluene), BHA is a white or yellowish solid that is soluble in oil and insoluble in water. It is often used in combination with other stabilizers, such as BHT or vitamin E, to enhance its antioxidant activity.
BHA works by inhibiting the oxidation of the fragrance ingredients, which can cause the fragrance to lose its scent or change in scent over time. By stabilizing the fragrance, BHA helps to ensure that the fragrance will maintain its original scent and quality for a longer period of time.
Like BHT, the appropriate concentration of BHA in perfume making can vary depending on the specific fragrance formula and other ingredients used in the perfume. However, in general, BHA is used at low concentrations in perfume making, usually less than 0.1% of the total fragrance formula. The exact concentration of BHA used will depend on a variety of factors, including the stability of the fragrance, the intended shelf life of the product, and any regulatory requirements.