From the 18th century, banknotes were being developed mainly by copper-plate engraving and printing, and they have been solitary-sided. Note-earning systems remained largely unchanged in the 18th century.[60] The first banknotes were made by intaglio printing: this involved engraving a copper plate by hand then covering it in ink to https://ricardoyjtck.59bloggers.com/27300544/manual-article-review-is-required-for-this-article