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How Can You Tell if Something is Bronze?

 
 
cjhsa
 
Reply Wed 16 Jul, 2008 08:11 am
As opposed to brass or other similar alloys?

I know how to spot ferrous metals, but this one has me stumped.
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Type: Discussion • Score: 1 • Views: 24,595 • Replies: 9
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djjd62
 
  1  
Reply Wed 16 Jul, 2008 08:14 am
if there are two other people ahead of you it's bronze
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Equus
 
  1  
Reply Wed 16 Jul, 2008 08:35 am
Bronze is a substance you'll probably just need to learn by seeing a lot of it. Both Bronze and Brass look coppery when new.

Bronze forms a patina or corrosion "skin" as it ages. Most metal statues that have a dark blue-green or brownish patina are going to be bronze. Bronze is Copper and Tin, and rather hard and heavy.

Brass is corrosion-resistant, so if it shiny metallic yellow and isn't Gold, it is probably Brass. Brass is Copper and Zinc, rather hard but lighter than Bronze.

Bronze is more commonly used in statues and art objects. Before the discovery of Iron, ancient weapons and tools were made of Bronze (the Bronze age).

Brass is more commonly used for musical instruments like horns, machine parts, cookware, household items.

Bronze
http://www.murrayco.com/eleganza/graphics/Indian_Scout%20Thumbnail.jpg

Brass

http://upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Trumpet_1.jpg/200px-Trumpet_1.jpg
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cjhsa
 
  1  
Reply Wed 16 Jul, 2008 08:59 am
But is there any simple test to tell them apart?
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username
 
  1  
Reply Wed 16 Jul, 2008 09:21 am
I googled it, and apparently the distinction between the two isn't really clearcut. It's not just brass is a copper-zinc alloy and bronze a copper-tin alloy. There are apparently more than two hundred different alloys that could be either one or the other, and some brass alloys are called bronze. So it seems like you're gonna have problems.

Here's one answer, which involves drilling a hole (number 8)http://answers.yahoo.com/question/index?qid=20060803230342AAEHfdg

Here's another from an industry representative
http://www.mail-archive.com/sslivesteam@colegroup.com/msg14389.html
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username
 
  1  
Reply Wed 16 Jul, 2008 09:23 am
Don't know why that first one didn't turn blue for a link. You may have to cut and paste it.

Unfortunately it looks like the answer to your question is no, it's not simple.
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Region Philbis
 
  1  
Reply Wed 16 Jul, 2008 09:32 am
(a space was needed between the closed parenthesis and the URL)
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djjd62
 
  1  
Reply Wed 16 Jul, 2008 09:32 am
form the material into the shape of a monkey with large testicles

wait for a cold day, if the testicles fall off the material is brass
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cjhsa
 
  1  
Reply Wed 16 Jul, 2008 10:36 am
I was thinking witches titties.
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neologist
 
  1  
Reply Wed 16 Jul, 2008 11:29 am
If its old. Bronze has the most interesting range of patinas. New bronze can be any color from silver to gold.
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