Special colored glass insulators were produced in only a few cases. Different currents can also be designated by different colored insulators. Add per M for colored glass . There are many factors that determine an insulator's value. Shape, color, embossing, condition, desirability and rarity all affect its value.
Most insulators are quite common and have little monetary value.
The first step in determining your insulator's value is to determine which insulator you have. A slight difference in the shape of your insulator can affect its value by twenty fold or more. A slight difference in color can also significantly affect the value of your insulator. The two obvious ways to add insulators to your collection are either to find them, or to buy them. Many beginning collectors may find insulators at antique stores, flea markets, and the like, but you will soon realize that your section is very limited, and the insulators are generally overpriced.