Jade 403 is considered the gold standard of all the PVA glues. It has been tested at the highest levels in terms of its archival characteristics. It is pH neutral, acid free, dries and stays flexible, non yellowing, water soluble, and contains no solvents. It is the most recommended PVA glue by professional bookbinders. While the image shows range of glues from 4 ounces to 32 ounces, this item is a 64 oz (half-gallon) container.