I never knew.

[Roustabout 14]

Csn someone tell me how long 14k black gold been around

 

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Agony and Death on a Gold Rush Steamer: The Disastrous Sinking of the Side-Wheeler Yankee Blade - Grab it through Amazon!

[Papalittle]

Never heard of it...now black hills gold i've heard of..

 

[pkb]

black gold,Texas Tea, Jed Clampitt

 

[Charlie P. (NY)]

Texas Tea?

Gold alloyed with cobalt or chromium - but I have no idea when it was first used.

Cobalt was mixed with glass to get a blue color by the Egyptians and Romans so it has been known and experimented with for a long time.