blue copperas

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Definitions from WordNet

Noun blue copperas has 1 sense

blue vitriol, blue copperas, blue stone, chalcanthite - hydrated blue crystalline form of copper sulfate
--₁ is a kind of copper sulfate, copper sulphate, cupric sulfate, cupric sulphate

Definitions from the Web

Blue Copperas

Definition: Blue copperas is a historical term referring to a ferrous sulfate compound that was commonly used as a dye and ink during the 18th and 19th centuries.

Example Sentences:

The artist mixed blue copperas with water to create a vibrant blue pigment for her painting.
During the Victorian era, blue copperas was extensively used for producing blue ink for writing.
The textile industry relied on blue copperas to dye fabrics in various shades of blue.
Chemists discovered that blue copperas could be used as a mordant to fix dyes to fibers.
The manuscript's handwritten notes had faded over time, but traces of blue copperas ink were still visible.

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