Mascaras are products intended to enhance the appearance of the eyes by thickening, lengthening, and usually darkening the eyelashes. Mascaras are usually applied with a brush. Mascaras contain special ingredients that apply the product where it is needed in a precise and controlled manner. The products are specially formulated to ensure that potentially harmful microorganisms cannot grow and multiply. The safety of Mascaras is established by selection of ingredients that are safe and suitable for this purpose. In addition, Mascaras 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.