removing reduction

[John Teeter]

I've got a bunch of pieces with frit on the very outside that I mapp torched the punty marks smooth before putting them in the annealer.

I got some reduction from the mapp gas torch. I'd like to remove it...without resorting to cold working.

In the past...I've used like 600 grit wet sand paper and just rubbed it off...course this leaves it less than perfectly smooth...and you can't get into all the little nooks and crannies so well.

I'm wondering if anyone can suggest a chemical cocktail that I could use to dissolve off the reduction?

I have copper and gold that has reduced to the surface...

I tried HCl and peroxide...and while it was starting to attack the copper, it didn't do much to the gold. I assume it is gold...the colors in that area were gold amethyst and gold ruby.

thanks!
John

[Paul Koehler]

thinking if reduction is problem oxidation is answer ..pot nitrate ..just a thought ..

[Ted Trower]

Tarnex silver polish can do the job if the reduction isn't too heavy. Never tried soaking it, just wet a cloth and rubbed it on.

[Pete VanderLaan]

HCL and peroxide can be an explosive combination in the presence of a hydrocarbon. Watch it.

Brillo pads?

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[Charlie Correll]

how about an oxy/prpane torch, into oxidation? Usually works for me.

[Glenn Randle]

Did you try just using the felt wheel with cerium? I recall that working, and it won't scratch.

[Pete VanderLaan]

Originally posted by Charlie Correll
how about an oxy/prpane torch, into oxidation? Usually works for me.
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I think he wants to do it cold.

[Scott Novota]

Explosive like vinegar and baking soda or explosive like Chlorine trifluoride and anything it touches?



Scott.
.

[Scott Dunahee]

My employer uses a product called No-San.

I dunno what it is, but he pays hazmat shipping and always works with gloves when he is using it. I'm guessing it's a very low strength HF solution. It does knock the reduction right off leaving shiny clean looking glass behind.

Personally, I'm scared of the stuff, but it does work. I would read a MSDS and follow all appropriate safety precautions before using it.

BSD

[David Patchen]

I like the suggestion of cerium vs. exploding acids. Yuk.

Or, you could just not get the reduction in the first place.

[Roger Gandelman]

We use cerium on the felt all the time for that problem.

[Pete VanderLaan]

[QUOTE]Originally posted by Scott Novota
[B]Explosive like vinegar and baking soda or explosive like Chlorine trifluoride and anything it touches? [QUOTE]
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No, as in incendiary.