Much like etching a PCB, Blake started with a copper sheet, writing and drawing his works backwards with stopping varnish, an acid-resistant varnish that sticks around after a nitric acid bath.

The process involved looks to recover copper and nitric acid from copper nitrate, a common waste byproduct of processing metal. While a process called thermal decomposition exists to accomplish ...

Scratch tests and nitric acid tests will damage the item a bit ... Whether you're trying to determine if your copper hardware is real or fake or looking for fixtures of solid brass, make sure ...

Common cotton is one of the forms of lignine, which is a compound of carbon, hydrogen and oxygen (the same as wood), but when subjected to the action of nitric acid, nitrogen enters into its ...