Aluminum — used in the kitchen and the most popular because it is lightweight, attractive, and less expensive. It requires to be kept shiny and clean. It also gives even heat distribution no matter what heat temperature you have. It is available in sheet or cast aluminum. Since it is a soft metal, the lighter gauges will get dent and scratch easily, making the utensils unusable. Aluminum turns dark when used with alkali's such as potatoes, beets, carrots, and other vegetables. While acid vegetables like tomatoes will brighten it.