Spoon Still Life Photograph - Polished And Tarnished Silver Spoons by Science Photo Library

Polished And Tarnished Silver Spoons is a photograph by Science Photo Library which was uploaded on August 5th, 2016.

Polished And Tarnished Silver Spoons

Silver tarnish. A pair of spoons, one recently polished and the other with a dark tarnish. The tarnish is a layer of silver sulphide, formed by a... more

by Science Photo Library

Canvas Print

$70

Framed Print

$96

Art Print

$45

Poster

$45

Metal Print

$93

Acrylic Print

$101

Wood Print

$73

Greeting Card

$30

iPhone Case

$42

Title

Polished And Tarnished Silver Spoons

Artist

Science Photo Library

Medium

Photograph

Description

Silver tarnish. A pair of spoons, one recently polished and the other with a dark tarnish. The tarnish is a layer of silver sulphide, formed by a reaction with oxygen and trace amounts of hydrogen sulphide in the air. The reaction is describe by the equation 4Ag + O2 + 2H2S = 2Ag2S + 2H2O. Once a thin layer of tarnish forms it blocks further hydrogen sulphide reaching the silver below, thus tarnish is a self-limiting process. Tarnish can be removed electrochemically, but is normally removed by polishing with a very fine abrasive.

Uploaded

August 5th, 2016