Dating base 1
Of course, soda & beer were reused up until quite recently.
The bottle pictured to the right has a Wait's Liver and Kidney Bitters label pasted over the embossing of a Star Kidney and Liver Bitters bottle!
See the Bottle Typing/Diagnostic Shapes page for more information on the subject..
And last, but definitely not least, is the fact that the art and science of glassmaking had a lot of glassmaker/glassblower induced uniqueness in the form of variations, errors, experimentations, and retrogressions.
We can always have some indication of a starting date for a technique if we can find who first put the idea into practice.
Utilitarian bottles include the majority of the bottles in the following bottle categories or types: soda, mineral water, beer, milk, proprietary medicine, druggist (excluding shop furniture), chemical, foods & sauces, household (including ink, shoe polish, cleaners, personal hygiene related items), common wine containers (excluding decanters), champagne, and most non-decanter spirits/liquor bottles.
Other diagnostic tools must be used to date these items.
Shape is more indicative of function - i.e., what the bottle was used for or contained - but even that has a myriad of exceptions.
)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.