Glassine paper is a special type of paper with myriad uses! The paper is acid-free, making it suitable for interleaving between pages in a book or protecting the surface of paintings and prints. The finish is smooth and glossy and it is air, water and grease resistant.
When gilding glassine paper is sometimes uses as a barrier when burnishing, and it laid over the gold to be burnished before polishing through the piece of paper, helping to protect the gold.