The DU Lounge

Next are, cobalt blue, royal purple, emerald green and a really dark amber described as 'black glass'. These are the more sought after colors of glass telephone, telegraph and power insulators I began collecting about the age of fourteen. There's also a carnival glass color of insulator mostly used in power applications. It's basically an orange based color with iridescence varying with the amount of metallic salts used to coat an otherwise clear glass. you've probably seen other types of glassware treated with this same process.