Is Optix lightfast? All coloured papers will fade if exposed to strong light for an extended period. Optix is at least as colour fast as other brightly coloured papers on the market. Is Optix Archival? Optix complies with Australian standard AS 4003 and international standard ISO9706 for permanent papers. These standards specify pH, tear strength, alkaline reserve and resistance to oxidation. To quote from the Australian standard, accreditation means: "publications and documents using paper made to these specifications will be relatively stable and therefore can be expected to survive for long periods without significant deterioration, if stored and used under normal library and archival conditions" Is Optix Acid Free? Yes. Acid free paper is a vague term normally taken to mean any paper that does not contain any acidic substances that may contaminate or affect any acid sensitive materials with which it comes in to contact. Optix is made using an alkaline process which results in a slightly alkaline pH. The paper contains an adequate reserve of alkaline buffer in the form of Calcium Carbonate to buffer the pH extract to approximately 7.5 to 10.0. As such these Optix is acid free. Is Optix recycled? No. Optix is made from fibres sourced from sustainably managed forests. It is made without recycled fibre to ensure premium strength properties, archival properties and bright, uniform colours. Got a question? Curious about the technical side of Optix? Just ask Ollie.