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UV Coating (ultra-violet coating) and 'J&B UV Test C' |
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UV Coating (ultra-violet coating) and 'J&B UV Test C' - Paper and other cover materials (such as bookbinders cloth) can naturally fade and degrade over time. This aging process is greatly accelerated when these materials and their coatings (including inks and dyes) are exposed to light. The vast majority of harmful effects to books and book materials are caused by light of a certain type, UV light. Ultra-violet (UV) light is normally undetectable by itself, however its most common source is the sun. Sunlight is a rich source of UV light and UV light is dangerous to human skin and eyes. As the dangerous effects of human skin's exposure to UV -- sunburn -- varies from person to person and place-to-place, so does the effects of UV on books and book materials and their location.
It is always prudent to keep books out of direct sunlight and in a location low in UV light. However, this is not practical. People who read books and write in journals do so virtually anywhere and everywhere. Book paper, cover materials including cloth, leather, inks and dyes can be coated with special sunscreens (UV coatings) that are permanent, invisible and durable.
Like coatings used to create visual effects, such as sheen (matte, satin and gloss) or to seal inks (to prevent rub-off), UV protection, needs to be applied properly. JournalsandBooks.com laboratory has developed a series of tests to measure product and material quality and performance related to light exposure. Our test 'J&B UV Test C' is used to predict and determine whether a the exterior of a book or journal will sufficiently resist exposure to harmful light including UV light over long periods (years or decades). 'J&B UV Test P' is used to test a book's interior and inside of the book materials quality and performance related to light exposure.
see also: show-through or bleed-through.
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