Guardian
... that "Guardian" is the base substrate for polymer banknotes printed by many central banks?
... that "<b id="mwBgs"><a href="./Guardian_(polymer)" id="mwBgw" rel="mw:WikiLink" title="Guardian (polymer)">Guardian</a></b>" is the base substrate for <a href="./Polymer_banknote" id="mwBg0" rel="mw:WikiLink" title="Polymer banknote">polymer banknotes</a> printed by many <a href="./Central_bank" id="mwBg4" rel="mw:WikiLink" title="Central bank">central banks</a>?