Your Hourly Horary Reading by Bill Kennick Cancer the Crab metal is silver. Color is silver or silver tarnish, Color of the moon which is Cancer's planet. Hence, the name moon child-- which does not have the connotations of the disease Cancer. All signs get cancer. Moon children have frequent stomach aches. and are crabby. Polkadots amd Moonbeams. Al H Morrison from New York told me that women born in the last degree of Cancer (approx July 23) tended to wear dresses with small Polka Dots.