BHT stands for butylated hydroxytoluene, which is a synthetic antioxidant commonly used in perfumery as a stabilizer to prevent the fragrance from degrading over time. BHT 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 BHA (butylated hydroxyanisole) or vitamin E, to enhance its antioxidant activity.
BHT 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, BHT helps to ensure that the fragrance will maintain its original scent and quality for a longer period of time.
While BHT is generally recognized as safe by regulatory agencies, there is some controversy around its safety in certain applications, particularly in food products. However, in perfumery, BHT is used at low concentrations and is considered to be safe for use in fragrance products.
The appropriate concentration of BHT in perfume making can vary depending on the specific fragrance formula and other ingredients used in the perfume. However, in general, BHT is used at low concentrations in perfume making, usually less than 0.1% of the total fragrance formula.
The exact concentration of BHT 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.
It's worth noting that the use of BHT, like other synthetic ingredients in perfumery, is subject to regulatory oversight and restrictions in some countries. For example, the European Union has placed limits on the use of BHT in cosmetic products, including perfumes, due to concerns about its potential health risks. As a result, some perfumers may choose to use alternative stabilizers or natural antioxidants to preserve their fragrances instead of or in combination with BHT.