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Gallery archiving potential

Gallery archival potential is a figure that expresses the ability of a photo paper to preserve a printed photograph in its original quality for a very long time. This parameter describes the resistance of the paper and the print on it to ageing, which includes in particular colour fading and degradation of the paper material itself. Several factors affect the life of a photograph, mainly light, airborne impurities such as ozone and the chemical composition of the paper itself. Photographic papers with high archiving potential are therefore made from specific materials. They are usually described as 'acid-free', which means that they do not contain acids that would erode the paper fibres and cause them to become brittle over time. They are also often free of lignin, a woody substance that causes paper to yellow. The quoted lifetime value, often in the tens to hundreds of years, applies to the specific combination of paper and the recommended original inks, as their chemical reaction with each other is key to the final permanence. Using a different ink can significantly reduce the durability. This parameter is therefore used to identify materials suitable for printing photographs where the aim is long-term display or archiving, for example for the sale of copyright prints, exhibition purposes or the preservation of family heirlooms.

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