Lash glue is a crucial component in the application and retention of eyelash extensions. It is primarily made of cyanoacrylate-based adhesive, color pigment, and additives, with cyanoacrylate making up about 88 to 90 percent of the glue
. The additives include stabilizers like hydroquinone, which prevent the glue from hardening inside the bottle, and carbon black, which gives the glue its dark color
. It's important to note that formaldehyde is not an ingredient in lash glue, but it can be formed as a by-product during the production process
. When using lash glue, it's essential to store it correctly and be aware of its properties to ensure maximum adhesion and the safety of the client
