Glass Insulator Cobalt Blue Armstrong Stained Decorative Glass. Vintage glass insulators are beautiful and are collected by many around the world. These are authentic approximately 100-year-old clear glass insulators that we have enhanced with glass stain applied as a spray aerosol. We create each one of our enhanced antique glass insulators in our restored 150-year-old Tobacco Barn shop. I call it the bro barn. These insulators are enhanced with a cobalt blue stain, making them even more stunning than their original clear shade. A clear coat of the highest quality protectant is then applied, sealing the stain and providing protection from prolonged exposure to sunlight as well as an increased level of scratch resistance. These antique insulators are very heavy and are made of solid glass in the USA. Because these are approximately 100 years old some of them may show signs of age. There are no sharp edges, cracks, or significant chips. The blue color captures the sun beautifully and makes the insulator a joy to look at. If you are not satisfied for any reason with your items, simply reach out to us. We are friendly and we always believe that there is a mutually equitable solution. We always try our best to ship on the same day of purchase. Thank you for considering our listing.