Banksy RAT Print, Gross Domestic Product , by smasher on Oct 31, 2021 20:31:31 GMT 1, Proper way to mount, frame, display delicate paper artefacts. Float mount print using Japanese paper hinges, blind style. Always mount onto the card backboard and not the window, use museum board.... ( not acid free board)....museum board is much higher standard....framer standard acid free is crap. Use UV filter glass to protect artefact from photo-chemical damage ( light damage ). Ask for polyester lining behind back board to protect from dramatic humidity effect. Don't hang in or near bathrooms, utility rooms, cold spaces, or areas that get a lot of natural or artificial light. Examine your work from time to time. All paper will yellow to varied degrees according to what paper type it is, how well or badly it is mounted and framed, and how much hassle it gets from light and humidity...thats life......but if you mount and frame using the best conservation materials and methods you will be ok. Yellow discolouration in paper ( photo-chemical oxidation ) can be restored. 

Sean ( professional paper conservator )