While researching anodizing, came across the fact that bismuth is also used for fishing sinkers.
http://www.observationsblog.com/sciencetechnologyexperiments/anodizing-and-dying-aluminum-without-battery-acid

There are also Bismuth 58%, Tin 42% alloys, (and other alloys). Melts at 520 degrees Fahrenheit +/_. Density 75% of lead.
Bismuth, 80% of leads density.
Bismuth is brittle.
Bismuth expands 3.3% when solidifying.

Lead melts at 621.5 degrees F.
Tungsten density is 19.25 grams per cubic centimeter, versus Lead at 11.33 g/cc. Melting point, 6,191.6°F, so not relevant.

- Brian