1,4-Dipropionyloxybenzene, also known as Tetrahydroxypropyl Ethylenediamine, is a chemical compound that is used in cosmetics as a crosslinking agent and emulsifier. It is mainly used in hair dyes and hair care products. Here are its cosmetic functions and applications:

1. Crosslinking Agent: 1,4-Dipropionyloxybenzene acts as a crosslinking agent in hair dyes and hair color products. Crosslinking agents help improve the durability and color stability of the dye on the hair strands, resulting in longer-lasting hair color.

2. Emulsifier: This compound also functions as an emulsifier in certain hair care products, such as hair conditioners and styling products. Emulsifiers help to mix and stabilize oil and water-based ingredients in a product, ensuring a consistent texture and application.

1. Hair Dyes: 1,4-Dipropionyloxybenzene is commonly used as a crosslinking agent in permanent hair dyes. It helps fix the color molecules to the hair shaft, providing a more permanent and vibrant hair color.

2. Hair Color Products: Apart from permanent hair dyes, this compound may also be found in semi-permanent or demi-permanent hair color products to enhance color longevity.

3. Hair Conditioners: In some hair conditioners, 1,4-Dipropionyloxybenzene acts as an emulsifier, helping to blend the water and oil-based ingredients for a smooth and consistent conditioner formula.