siderography
... that siderography, a process to produce counterfeit-resistant banknotes, was submitted for an 1817 Bank of England contest in an era when English banknotes were known as "filthy rags"?
... that <b id="mwCC0"><a href="./Siderography" id="mwCC4" rel="mw:WikiLink" title="Siderography">siderography</a></b>, a process to produce counterfeit-resistant banknotes, was submitted for an 1817 <a href="./Bank_of_England" id="mwCC8" rel="mw:WikiLink" title="Bank of England">Bank of England</a> contest in an era when English banknotes were known as "filthy rags"?