Face Powders are products that are intended to change the appearance of facial skin. They typically work by applying color to the skin or through other effects such as altering the reflection of light or the shininess of the skin. They are typically applied using a brush. Face Powders contain ingredients that apply color and/or powder to the skin in a precise and controlled manner. Face Powder product safety is established by selection of ingredients that are safe and suitable for this purpose. In addition, Face Powders are assessed for their potential to cause skin irritation or cause allergic reactions. Product safety is also ensured though strict adherence to the principles of Quality Assurance and Good Manufacturing Practices. This includes testing the compatibility of the product with packaging as well as shelf-life stability. Finally, the safety of products is monitored in the market-place to track any consumer comments or complaints. Companies include a phone number on their products where comments or complaints may be reported.