Question

Metals are said to be shiny why do metals generally appear to be dull how can their brighness be restored

Answer 1

Answer:

Explanation: There dullness is because of extracting them in heat or in a place where insufficient air flows

Answer 2

Answer:

metals are generally shiny when they are polished but when they are exposed to environment the moist oxygen and water sulphur other make it to react and forms it's oxides it leads to loss of shiny ness