Infra-red heater produces optical corona in St Edmund's, East Mersea

 

The parish church at East Mersea was wonderfully welcoming. The infra-red heaters produced a different type of optical corona through the steamed-up glasses than white lights. As expected, it was dominated by red wavelengths. Water vapour is an absorber of infra-red that then reradiates in all directions in the atmosphere. It would be interesting to try to see what such steaming up might do with an infra-red detector.