This 6.0 pH starch paste is specially formulated to provide a long service life as an archivists and bookbinding paste. The inclusion of a fungicide (0.15%) enhances both stability and complete protection of the adhesive while in use. It is used in book repair and picture mounting. Bookbinders Archival Starch Paste is particularly useful for end papering and general hand book binding work where its smooth slow setting properties aid positioning. It is also ideal for many other purposes, including case-making and the mounting and repair of ephemeral material, and can be used for the production of archival quality envelopes and folders. This starch paste is slow-setting, allowing easy position realignment, and contains a fungicide for improved shelf-life.WS1650 is soluble in water, thus it can be reversed and diluted in water.