Noun
ferric chloride (uncountable)
an inorganic compound with the formula FeCl3.
Others, such as printmakers Mark Zaffron and Keith Howard, developed systems using acrylic polymers as a ground and ferric chloride for etching. Source: Internet
The exposed metal lines are then etched by dipping the plate in a bath of etchant (e.g. nitric acid or ferric chloride ). Source: Internet
When used for etching, ferric chloride does not produce a corrosive gas, as acids do, thus eliminating another danger of traditional etching. Source: Internet