The Jars are made from the trademark Ball Corporation blue tint soda - lime glass, The blue glass came as a bi-product, in production, the sand from Lake Michigan turned blue in the glass making process.
If a glass is coloured purple, it means that manganese dioxide was used to make glass look clear and transparent. Exposure to sunlight though caused the glass to turn purple. During World War II, glass makers shifted to selenium as supply for manganese dioxide was limited. The last of these were produced in 1937, they are still produced in clear glass.
However the lids to have a trademark construction that we dont see anymore in these types of jar. The lis is made from Zinc and the inside seal in these lids also made of glass, which is white.
1. Pint Size H14cms X W7cms - Available in Purple Colour Only
2. Quart Size H18cms X W9cms - Available in Blue Colour Only
Includes threaded Zinc lid with inner White glass sealent layer.
