Letâs have a look on wide varieties of Furnace Kiln Observation Cobalt Blue Glass which is manufactured using super grade raw materials and advance technology under the supervision of professionals and experts. This glass is used to decrease the brightness of furnaces during metal and glass work. This glass has special properties that both allow you to see better into extremely bright furnaces and allow you to see more clearly and with more contrast the objects you're working on. Furnace Kiln Observation Cobalt Blue Glass is designed with the furnace observer in mind, and it allows those who are observing hot furnaces without IR radiation to see into the furnace so they can reduce eye fatigue and increase their vision of the items in the furnace. This glass is available at nominal rates for our esteem customers.