Honey and compounds found in these types of jars tend to be very dark. This is a very common trait of honey darkening with time. To determine the date when the bottles were made you may find a date from the glass company that made the bottle, when thepatent was granted, the style of the bottle lip, the date of the advertising literature, an indication of the date by the label on the bottle, or sometimes the level or layer in the ground where the bottle was found.It is interesting to read about all of the claims that were made about the mixtures and one can see where the term "Snake Oil Salesman" may have come from.
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