Dating subject line

08 Dec

When a likely or known "older" item is found in a known "newer" site it is referred to as deposition lag.An example of this is the finding of a few pontil scarred utilitarian bottles among otherwise late 19th or early 20th century refuse.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!(The two products were from separate companies which were cross-town [Sacramento, CA.] rivals during the late 19th to early 20th century.Unfortunately many old family photographs are not annotated with the sitter’s name. Will dating my old photograph help me to decide who the subject is?

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See the Bottle Typing/Diagnostic Shapes page for more information on the subject..

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).

In short, there was (and is) nothing to stop a glassmaker from using an obsolete method in the production of a bottle.3.

This technology lag makes some diagnostic characteristics better than others for dating. As a corollary to #1, consider the following quote: "Treat terminal dates with care.

We can always have some indication of a starting date for a technique if we can find who first put the idea into practice.