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Block tin with a small percentage of lead added should be used for pouring metal squids. Block tin can be obtained at times from a junk dealer who handles scrap metals. Used alone, it has a tendency to crack easily but adding some lead will make it more flexible and easier to bend without cracking. Bar solder used by plumbers also contains block tin but has too much lead, and must be mixed with pure tin to get a metal squid with a white silvery finish. It will be remembered that molds made from plaster of Paris or water putty have a short life and usually last just long enough to pour about two or three dozen squids. Then they chip up or crumble and a new mold must be made.
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