Vintage Blue Ball Perfect Mason canning jar with its original zinc Screw Cap EUC

Vintage blue Ball Perfect Mason canning jar with its original zinc and screw cap. Age: This type of jar, with the "Perfect Mason" embossing and blue tint, typically dates from the 1920s to the 1930s. Color: The distinctive blue color is achieved by the minerals used in the glassmaking process and was believed to help preserve food by blocking sunlight. Purpose: Originally, these jars were used for canning and preserving fruits and vegetables before the widespread availability of refrigeration. Modern Use: Today, vintage Ball Perfect Mason jars are popular collector's items and are often used for decorative purposes or for storing dry goods like flour, sugar, or craft supplies.