There are several nail polish brands available in the market, and their ingredients and materials can vary. Here is a summary of the information found in the search results:

• Common harmful chemicals in nail polish: Nail polish can contain harmful chemicals such as formaldehyde, toluene, and dibutyl phthalate, which are known to be toxic and can cause health problems.

• Non-toxic nail polish brands: Some nail polish brands are marketed as non-toxic and free of harmful chemicals. Examples include 100% Pure, Zoya, and Butter London.

• Ingredients in nail polish: Nail polish typically consists of a film-forming polymer dissolved in a volatile organic solvent, with nitrocellulose being the most common polymer used. Other ingredients may be added to give the desired finish, such as matte, duochrome, jelly, magnetic, crackled, or glass-flecked.

• Positive aspects of nail polish brands: Some nail polish brands are marketed as long-lasting, affordable, and having a non-toxic formula.

• Negative aspects of nail polish brands: Some nail polish brands contain harmful chemicals, are inaccurately labeled as non-toxic, or take longer to dry.

Overall, it is important to be aware of the ingredients in nail polish and choose brands that are free of harmful chemicals. Consumers can use resources such as the Environmental Working Group and Think Dirty apps to search for products by name or barcode and find ingredients of concern. Additionally, some nail polish brands have certifications such as "Verified" and "Made Safe" that signify products have met certain safety standards.