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All Conservation mountboards fully comply to Fine Art Trade Guild Conservation level.
High-quality alpha cellulose using pH sizing and lignin-free, except for Metallics which the surface papers are not acid-free.
Blue wool scale (BWS) minimum rating 3+.
Individual BWS ratings are marked on the reverse side of every sheet.
Buffered with calcium carbonate, minimum 3-5% by weight.
The water-soluble extracts are minimal i.e. chloride below 0.05%, sulphate below 0.25%. For extra defence it contains a buffer of calcium carbonate to guard against contamination by air-borne acid for the life of the board.
Passes the Silver Tarnish Test and Photographic Activity Test.
Aqueous PVA adhesive with neutral pH.
Colours may differ depending on device / monitor used