An egg wash is often used to make pastries shiny and golden or brown in color, and it also is used to help toppings or coatings stick to the surface of the pastry, or to bind pastry parts together, such as empanadas or other en croute recipes. Egg wash can usually be made with 30 ml or two tablespoons of liquid, such as milk or water, for every egg. Less liquid makes for a darker wash. The part of the egg used and liquid added determines the finished look of the crust.
what is the purpose of egg wash in baking
to make pastries shiny and golden or brown in color bind pastry parts together to help toppings or coatings stick to the surface of the pastry