Strange bluing on this button?

[pepperj]

Dug this from an early site, just flat buttons, Rose head nails, glass.
Never dug a button as this one, broken, but enough to show the blue.
Is it an enamel or guiding?


If anyone has any insight on this one please let me know.

 

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[Mud Hut]

Was it found in an area of high salts content? I dug some bluish looking copper ones on the east cost of Maryland.

 

[pepperj]

Was it found in an area of high salts content? I dug some bluish looking copper ones on the east cost of Maryland.

NE of Kingston Ontario, from an area that is forested now, sort of a ravine that gets pretty wet in the spring.
Soils are black loam, and every other button comes out pretty nice patina as one would expect from forest digging.
I was kind of thinking a blacksmithing operation as there was some shoes around of different sizes, and other iron that kind of tends to be from that source/trade.
Though I'm not certain as the there's not a whole lot of finds to say for certain.

 

[fyrffytr1]

I have seen objects turn that color after being exposed to fire or high heat.

 

[pepperj]

I have seen objects turn that color after being exposed to fire or high heat.

That might be what happened, thanks for the idea/thought.

 

[CRUSADER]

Looks like a tombac with a strange patination.