Lac sealing wax is a traditional adhesive substance used primarily for sealing letters, documents, or other items, often to ensure authenticity or tamper-proofing. It is made from a combination of shellac (a resin derived from the secretion of the lac insect), turpentine, and coloring agents, such as vermilion or other pigments.Historically, lac sealing wax was used extensively in correspondence and legal documents to verify the sender's identity through an impressed seal, often made with a signet ring or custom stamp.Modern sealing wax may incorporate synthetic resins or plastics to make it more flexible and resistant to breaking during postal handling, but traditional lac sealing wax is still preferred for ceremonial or decorative purposes due to its classic look and historical charm.