Thanks for your advice,I think I should calm down and take a bigger picture of view first.
When you say "dig",you always mean dig out from the earth?not a metaphro?You know dig bottles from earth reminds me a imagery of some kind of old school video games,that is very interesting and romantic.I think most glass bottles on sell in China are not dug but handed down.The targets we really dig to are alway be porcelain and bronzeware and so on,and glass would be an accident,and could be very very ancient to thousand years.But then,I'm so far from digging,wish I could have a chance one day.