My neighbor was cleaning out his garage the other day and found these. He kindly gave them to me. He said that this was the solder they used to solder roofs onto cars. I noticed on the bars they are marked Dutch Boy 20 Body Solder. Does the 20 refer to the tin content or lead? Was wondering if anyone has ever used some of this for sweetening a pot of WW's or such? Haven't tried any yet. Don't want to waste it until I find out some more info on it.