Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
Hallmark
(section)
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
===Fire assay=== The most elaborate, but totally destructive, assay method is the [[Metallurgical assay#Fire assay / cupellation|fire assay]], or cupellation. As applied to gold bearing metallics, as in hallmark assaying, it is also known as cupellation and can have an accuracy of 1 part in 10,000. In this process the article is melted, the alloys separated and constituents weighed. Since this method is totally destructive, when this method is employed for the assay of jewelry, it is done under the guise of random or selective sampling. For example, if a single manufacturer deposits a lot of rings or watch cases, while most are assayed using the non-destructive methods a few pieces from the lot are randomly selected for fire assay.
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)