Gold readily dissolves in mercury at room temperature to form an amalgam, and forms alloys with many other metals at higher temperatures. These alloys can be produced to modify the hardness and other metallurgical properties, to control melting point or to create exotic colors.Gold is unaffected by most acids. It does not react with hydrofluoric, hydrochloric, hydrobromic, hydriodic, sulfuric, or nitric acid. It does react with selenic acid, and is dissolved by aqua regia, a 1:3 mixture of nitric acid and hydrochloric acid. Nitric acid oxidizes the metal to +3 ions, but only in minute amounts, typically undetectable in the pure acid because of the chemical equilibrium of the reaction. However, the ions are removed from the equilibrium by hydrochloric acid, forming AuCl−4 ions, or chloroauric acid, thereby enabling further oxidation.
Nowadays, this "atypical cleft hand" is referred to as symbrachydactyly and is not a subtype of cleft hand. Notable cases
Bree Walker Once a popular television anchor woman in Los Angeles, she has appeared in the television drama Nip/Tuck as an inspirational character who battles her disease and counsels another family who have children with ectrodactyly
Grady Stiles Sr. and Grady Stiles Jr.: known publicly as Lobster Boy and family, famous side show acts, featured on the AMC reality show, Freakshow. The Vadoma tribe in northern Zimbabwe
Mikhail Tal, Soviet chess player, World Chess Champion 1960–61
Lee Hee-ah, a Korean pianist with only two fingers on each hand. Cédric Grégoire (better known as Lord Lokhraed) is the guitarist and lead vocalist of French black metal band Nocturnal Depression and has ectrodactyly on his fretting hand, which has only two fingers. Black Scorpion, freak show performer. Sam Schröder, 2020 US Open Quad Champion. Francesca Jones, British pro tennis player, former #149 in WTA rankings. Other animals
Ectrodactyly is not only a genetic characteristic in humans, but can also occur in frogs and toads, mice,  salamanders, cows, chickens, rabbits, marmosets, cats and dogs, and even West Indian manatees. The following examples are studies showing the natural occurrence of ectrodactyly in animals, without the disease being reproduced and tested in a laboratory. In all three examples we see how rare the actual occurrence of ectrodactyly is.