Precise duration of time.

TxBottleDigger

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Look through the bottom of the bottle sideways, that can be your first indicator.
Oh definitely. That’s what I always do. The thick glass reveals the purple all the time. It can be quite challenging sometimes to see if a bottle is purple. The lighting means everything.
 

Len

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Is UV light the only way it oxidizes? Digging purple bottles i have to say I don't know. Can time alone do it?
ROBBYBOBBY64.
Hi RB!
Both good questions. I read somewhere that most major bottle makers quit using manganese by about 1915.
 

ROBBYBOBBY64

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Hi RB!
Both good questions. I read somewhere that most major bottle makers quit using manganese by about 1915.
Germany supplied a large part of the worlds manganese, it was one of the first things they stopped exporting. We needed to find a new or different source, which we did.
ROBBYBOBBY64.
 
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Len

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Anyone know if the Germans resumed sending manganese in the '20s or '30s??
 

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