A concealer or color corrector is a type of cosmetic that is used to mask imperfections on the skin. These imperfections can include dark circles under the eyes, blemishes, and hyperpigmentation. Concealer is similar to, and can be used in conjunction with foundation, a lighter cosmetic that is used to even out the skin tone. Both concealer and foundation are typically used to make skin appear more uniform in color. These two types of cosmetics differ in that concealers tend to be more heavily pigmented, though concealer and foundation are both available in a wide range of colors opacities. To use a concealer, an individual typically applies a small amount of product to the area of the skin that they want to cover. The concealer is then blended into the surrounding skin using a brush, sponge, or the fingertips to create a seamless finish. Concealers can be applied before or after foundation, depending on the desired effect. Applying concealer before foundation can help to create a more even canvas for the foundation, while applying concealer after foundation can help to touch up any areas that still require coverage. Concealers comes in different forms such as liquid, cream, stick, pencil, and powder. The first commercially available concealer was Max Factor's Erace, launched in 1954. Camouflage makeup is a much heavier pigmented form of concealer. It is used to cover serious skin discolorations such as birthmarks, scars and vitiligo. Concealer is available in a variety of shades. When picking a concealer, people tend to choose one or two shades lighter than their skin tone to better hide their blemishes and dark circles under the eye. Some colors are intended to look like a natural skin tone, while others are meant to cancel out the color of a particular type of blemish. Concealers with yellow undertones are used to hide dark circles. Green and blue can counteract red patches on the skin, such as those caused by pimples, broken veins, or rosacea. A purple-tinted concealer can make sallow complexions look brighter. Forms Each type of concealer is unique and has qualities that are better suited for different skin types. Liquid concealer – Available in squeezable tubes, cylindrical tubes, or square tubes (also known as vials). Leaves a satin, radiant shimmer or matte finish. Liquid concealer is the most popular because it works for most skin types. This concealer also works well for acne