I found some information about nail art and ingredients that may be suitable for those with a "sawo matang" skin tone. Here are the details:

• Nail Art Ideas: According to a search result, some nail polish colors that may be suitable for a "sawo matang" skin tone include brown and nude shades. However, its important to note that personal preference and style should also be taken into consideration when choosing nail art.

• Ingredients: One search result provides a list of ingredients for Nailboo® products, which are cruelty-free and made in an FDA-approved factory. However, its important to note that not all nail polish brands use the same ingredients, and some may contain harmful substances. For example, a search result provides a list of notified cosmetic products in Brunei Darussalam, which includes some products that have been banned due to the presence of harmful substances.

Its important to do research and choose nail polish brands that use safe and high-quality ingredients. Additionally, personal preference and style should also be taken into consideration when choosing nail art.