Why are there different colour variations in Pressed Glass?
If your glass has a green or grey tint, this is from the sand used, either the iron or lime. If your glass has a purple or pink hue, this is a chemical called Manganese. It was used to combat the green or grey tones created by iron. If you leave your Pressed Glass in the sun for long periods (like displaying oil lamps in your window frame) the purple colour will eventually darken because Manganese reacts to sunlight rays.
