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Old 08-01-2017, 10:23 AM
Dan Vanantwerp Dan Vanantwerp is offline
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Tricky blemish

I chronicled my calcedony prep on another thread. This is a piece from that work with a little blemish on the face. It happened right on the subtle inside curve with some small water drops from the parchoffis, I think...might have been some water that got on my paddle.

I have seen some great suggestions on the forum for coldworking, but this is in such a prominent spot and right along a curve. I have a lathe with some nice 4" spherical wheels. I have also tried the flex shaft types of fix (cratex, his glassworks polishing discs) which always seem to leave a noticeable spot.

I'm a realist and have played with coldworking enough to know its limitations...at least in my hands. Would blending this in make it look better or worse?
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Old 08-01-2017, 10:53 AM
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Pete VanderLaan Pete VanderLaan is offline
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You'll never get it to the point of not noticing it. Outside curves, yes, inside curves, no and I'm a polishing fool. It doesn't get better than a fire polish but it sure can get worse.

Dremel style tools just can't generate the surface feet per minute without chatter. You need about 300SFPM to pull it off and even then, the radius makes for an uneven attack which brings one back to the Late Dan Fenton saying

"Glass remembers everything you ever do to it. " RIP Dan.
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Old 08-01-2017, 11:03 AM
Jordan Kube Jordan Kube is offline
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I would try straight cerium first. Looks like it's just on the surface.
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Old 08-01-2017, 11:26 AM
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Pete VanderLaan Pete VanderLaan is offline
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Quote:
Originally Posted by Jordan Kube View Post
I would try straight cerium first. Looks like it's just on the surface.
*****
I agree, only cerium, preferably really a good quality one but I'd be surprised if there is not a sub stain under the obvious ones that is a ring shape
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Old 08-01-2017, 11:28 AM
Chris Lowry Chris Lowry is offline
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I have some luck with cerium on a cloth and just rub it... only for those smallest marks that won't clean off with anything else. Other than that I agree with Pete and always make it worse.
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Old 08-01-2017, 11:46 AM
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Sky Campbell Sky Campbell is offline
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I personally don't like the shiny look of chalcedony as much as a mat finish. I would acid wash it or lightly sandblast the surface. it's worth trying and you might just love the look.
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Old 08-01-2017, 05:49 PM
Peter Bowles Peter Bowles is offline
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Looks like it might be a wax residue rather than water.

You could try a soft cloth with a dab of bicarb of soda, white vinegar and meths.
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Old 08-01-2017, 06:41 PM
Dan Vanantwerp Dan Vanantwerp is offline
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Hi Peter, The spots do look a little "waxy" brown but my fingernails were unable to get anything to budge. Same with my glass cleaner and a paper towel. I think I'll try your suggestion first and work my way up the harshness scale to some cerium. If that doesn't get it I'll call it a second and try to avoid the problem to begin with.

I liked Skye's suggestion also and will try to sandblast one of these in the future. The "calcedony bar murrini" piece posted in another thread was finished this way and turned out very nice. However, I really like the look of calcedony on a clear glass finish and the colors are particularly nice in this piece.
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Old 08-01-2017, 08:32 PM
Eben Horton Eben Horton is offline
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That is fired on jack jack wax.

I would do what Sky suggests... Acid etch it.
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Old 08-02-2017, 05:57 AM
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Not ..."Jack Jack Wax?...
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Old 08-02-2017, 06:31 AM
Steve Beckwith Steve Beckwith is offline
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While I am way, way out of the loop here, I still like to lurk. I used to use a pencil eraser with a paste of cerium for removing small spots. Sometimes it worked, sometimes not.
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Old 08-02-2017, 01:43 PM
Dan Vanantwerp Dan Vanantwerp is offline
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Tried the least aggressive suggestions. First the cleaning concoction and then a little cerium on a rag. Nothing doing...didn't leave any haze either so no harm-no foul. Guess I've got some relatively good cerium. Going to step it up to the lathe and a cerium loaded felt wheel tonight.

I like David Patchen's suggestion of masking off the area with electrical tape. If I don't like it I may just do the etching...I prefer blasting though to acid.
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Old 08-02-2017, 02:08 PM
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blast and oil. Don't crack it.
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Old 08-14-2017, 11:14 AM
Dan Vanantwerp Dan Vanantwerp is offline
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Result: Blast and oil

Here is the final result with the quick, light sandblast and oil. I use the most aggressive media...silicon carbide...as I do some graal technique. Love this final look.
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Old 08-14-2017, 01:02 PM
Eben Horton Eben Horton is offline
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Beauty!!!!!!!
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Old 08-14-2017, 03:45 PM
Eric Trulson Eric Trulson is offline
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That really is gorgeous.

Thank you for posting up the after shots, it really shows off how much the sandblasting and oil change the piece. That color blending gets awful nice with a matte surface.
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