Our parchments hang in the Study, but HM's rubber stamp signature on mine has faded into oblivion, which is annoying. The OH's survives, 'cos she's a bit younger than me. But they have never been 'exposed' to sunlight - a quiet corner of the Study has always been their home.
You would have thought that the ink used would be 'life-proof', like Registrar's/Coroner's ink. Poor show, Your Majesty or appropriate Lackey. I shall never vote for you again