UKPhil
Registered
Mercury would be good, nice soft liquid-filled pouches, and heavier than lead ;-)
some comparitive densities:
Metal Brass 8.553
Metal Nickel 8.602
Metal Bronze, phosphor 8.8
Metal Copper, Pure 8.9
Metal Nickel, Pure 8.9
Metal Copper, cast-rolled 8.906
Metal Silver, Pure 10.5
Metal Lead 11.37
Metal Mercury 13.57
Metal Gold Coin (US) 17.19
Metal Uranium 18.74
Metal Gold, Pure 19.32
Metal Plutonium, alpha phase 19.35
Metal Platinum 21.3
Metal Iridium 22.16
some comparitive densities:
Metal Brass 8.553
Metal Nickel 8.602
Metal Bronze, phosphor 8.8
Metal Copper, Pure 8.9
Metal Nickel, Pure 8.9
Metal Copper, cast-rolled 8.906
Metal Silver, Pure 10.5
Metal Lead 11.37
Metal Mercury 13.57
Metal Gold Coin (US) 17.19
Metal Uranium 18.74
Metal Gold, Pure 19.32
Metal Plutonium, alpha phase 19.35
Metal Platinum 21.3
Metal Iridium 22.16