Hi Fellas, Need your help to solve a practical problem I've been facing. I run a company that makes products for foundries. Recently, we started work on developing a high temperature, high emissivity ceramic coating to paint the inside walls of a furnace. The motive behind the particular product was twofold - to protect the walls from damage, make sure the furnace life is extended; and since the emissivity of traditional firebricks is less than 0.5, we wanted to make a coating that will have an emissivity of > 0.8 to help cut fuel costs & decrease some of the heat losses by locking in the heat. Now, the problem is I've not been able to figure out the best (& cost effective set up) to calculate the emissivity of the coated/uncoated surface. Clients do not want to first paint their furnaces & then see the fuel savings; they want to know the actual emissivities of the uncoated/coated surfaces & will not invest before that. What will be the best way to do this?