Premise: Gold . In its purest form , it is a bright , slightly reddish yellow , dense , soft , malleable , and ductile metal . Gold is resistant to most acids , though it does dissolve in aqua regia , a mixture of nitric acid and hydrochloric acid , which forms a soluble tetrachloroaurate anion . Gold 's high malleability , ductility , resistance to corrosion and most other chemical reactions , and conductivity of electricity have led to its continued use in corrosion resistant electrical connectors in all types of computerized devices ( its chief industrial use ) .
Hypothesis: Gold is insoluble.
Label: CONTRADICTION