1. Is it shiny? If it has a glossy sheen to it it is likely covered in the toxic coating. 2. Does it say so on packaging or labels? If you are unsure, make sure you consult your supplier before possibly hurting yourself. Make sure they are about 3 feet (0. 9 m) long, so you can hold onto a cool part of the steel while forging on the ends or other parts of the bar.