Blank valve tags are used to prevent errors and accidents by identifying valves. Tags can come in a range of colors for easy color-coding. Aluminum blank valve tags are commonly dyed in blue, green, orange, red, or yellow and are resistant to moisture and abrasion. Brass and stainless steel tags can be imprinted with stamps and engravers. Both materials resist corrosion, although stainless steel is ideal in harsher environments. Plastic blank valve tags are lightweight, durable, noncorrosive nonconductive and impact resistant.