The company I work for is having some roofing done and they are trashing the copper(?) flashing. My question is this,,, is this actually copper? It appears to be copper and is very soft , heck i cut it with the serrated blade on my Gerber pliers. If it is, can it be used to make the copper "collar" (whats that called?) on a Japanese knife? I could get my hands on a lifetimes supply if I hurry. Thanks,,, JM