There is no specific information available about the ingredients or materials used in Brava Nails products. The search results only provide information about the services offered by Brava Nails Spa, which include Gel Manicure, Dipping Powder, Organic Pedicure, Acrylic, Waxing, Facial, and Eyelash Extension. However, some of the search results provide general information about the ingredients used in cosmetics and personal care products. For example, synthetic mica has no negative impact on skin, but some dyes used to color the product may be a health hazard. Additionally, some natural ingredients have been used in cosmetics for centuries, such as chalk mixed with saliva, which was used by Modoc warriors to paint their faces white and create designs using fingers or a brush. It is important to note that hazardous ingredients can be present in cosmetics and personal care products, such as preservatives, fragrances, and heavy metal impurities. Consumers should always read the labels and research the ingredients in the products they use to ensure their safety.