Amethyst Purple Keystone.

Dogo

DOGO
Naturally sun turned bottles are usually uneven in coloration as the sun hit one side more than the other. That one may have been done in a light box. That used to be a common practice.
 

jarsnstuff

Well-Known Member
so they did not make these in amethyst at all? This was what I was told. That is why i am asking.

The natural color of glass is aqua. Any other color is due to impurities in the glass or other added elements to turn the color intentionally. Before about 1900, manganese was used as a "clarifier" - or an additive that made the glass clear. It was then discovered that when clear glass was exposed to sunlight for extended periods of time, it would turn amethyst. Not so desirable for windows but not that big a deal for other items. Just how purple old glass will turn depends largely upon how much manganese was used. After about 1900, glassmakers started using selenium as the clarifier, which gives the glass a pinkish or yellowish cast.
 

ROBBYBOBBY64

Well-Known Member
I hate when I get misled.
The natural color of glass is aqua. Any other color is due to impurities in the glass or other added elements to turn the color intentionally. Before about 1900, manganese was used as a "clarifier" - or an additive that made the glass clear. It was then discovered that when clear glass was exposed to sunlight for extended periods of time, it would turn amethyst. Not so desirable for windows but not that big a deal for other items. Just how purple old glass will turn depends largely upon how much manganese was used. After about 1900, glassmakers started using selenium as the clarifier, which gives the glass a pinkish or yellowish cast.
I know that and I thank you for the refresher but I was under the impression or misled to believe that they made amethyst purple ones. So this one was at some point in time irradiated. I have a couple of clear glass bottles that are turning purple due to being in the sun. These I found on the surface are turning but not near as dark amethyst as this jar. I am thinking that this one is unnaturally done. One question, did they ever make amethyst purple mason jars that are not reproductions? I really appreciate your knowledge mainly because of my lack of expertise pertaining to jars. Thanks everyone for setting the (my) record straight.
ROBBYBOBBY64.
 

coreya

Well-Known Member
There are no natural made purple canning jars other than the modern and those sun, light box or irradiated ones that I know of. the drey is irratiated in my opinion
 

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