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A substantial amount of bottle type specific information must be reviewed by a user to increase the probability of dating accuracy.Additional reference materials outside of this website must often be consulted to narrow down the date of any item as far as is possible and to really get a "feel" for the history of the bottle in question.
Heavy duty bottles intended to be recycled and reused by the producer or distributor of the contained product (primarily soda, beer & milk bottles); or 3.
We can always have some indication of a starting date for a technique if we can find who first put the idea into practice.
But any technique, once developed, can be used right up to the present - as many collectors know who have been so unfortunate as to rely too heavily on a popular termination date as sure evidence of true antiquity..." (Toulouse 1969b).
)Reuse, of course, does not change the manufacturing date of the bottle itself, but care must be exercised when using the known date of one or a few bottles to date other items found from the same context.
When a likely or known "older" item is found in a known "newer" site it is referred to as deposition lag.