Dave,
As it is a positive image, I think that makes it a 'Lantern Slide.' I don't know how good the chemicals they used for 'fixing' were then, I would suggest not taking the risk to prolonged exposure to light. Try a polarizing filter, circular polarizing filters are recommended for reducing reflections from glass.
TimG
As it is a positive image, I think that makes it a 'Lantern Slide.' I don't know how good the chemicals they used for 'fixing' were then, I would suggest not taking the risk to prolonged exposure to light. Try a polarizing filter, circular polarizing filters are recommended for reducing reflections from glass.
TimG