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Dark stain on gold?


#1

Dear Orchidians In one ring I made a few months ago… A very strange,
and disturbingly mysterious dark ‘pach’, keeps re-appearing at a
small area on the gold surface…! It is to me a phenomena I never
encountered before? The piece is a 20k rose gold ring. with Opal and
diamonds, and because of the Opal, I have not tried to clean the
stain in the Ultrasonic. yet It come off with a rotary brush and
plain spit. And… When the lady who bought the ring, ware it, the
stain is beck within a day or two. Now [after it came back for
cleaning for the forth time.] I kept the ring in the studio, and the
stain hasn’t come back… yet! [ 4 days] my guess here is that while
its being worn, the heat, activate the…? mysterious black thing,
But I have no idea where it may be oozing from… I’ve been digging
in to the gold looking for a pore or hidden pit, but under a 50x!
microscope I can find no clue. there is a seam, just next to that
area, where the bezel is soldered to the body of the ring. yet the
seam looks perfect.

Please… any ideas,is there any thing I could try to do…? has
any one ever equator a similar problem? The lady is leaving in a
week. I must solve this one… Love & Light. akash
www.akashjewels.com


#2

stain hasn’t come back… yet! [ 4 days] my guess here is that while
its being worn, the heat, activate the…? mysterious black thing,
Is the client wearing another ring next to this ring? Could the
stain actually be coming from the other ring?


#3

Hello , I have seen similar stains from time to time . Do you
alloy your own metal ? you may not have a homogenous mix. possble
solution would be to gold plate over area . Secondly solder may
"stain" an area adjacent to its use , something in the solders alloy
reacts to enviromental chemicals in a different manner than the base
metal , you may not be able to see this in a polished piece , I
suggest re-sanding the area , to get through the contaminated area
and then polishing again , its done the trick for me in the past .

Mark Clodius