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Post by chris1956 on Sept 16, 2024 18:36:16 GMT -5
I received this from tribeunited. Thanks! I am not finished yet because it came off the dop stick as I was starting on the 3000 wheel.   I really like the fine bands and lighter green color compared to most of what I have seen (wider bands and a lot more of the dark green). Before I get bak to this I have a question. I have a slight flat spot and small scratches on the top of the dome that I need to take care of. I was concerned about going back to 280 to fix this because the coarser wheels seem to generate a gray/brown sludge that at a couple points looks like it stained the cab and was hard to get off after that. Is that staining common with Malachite? There is one spot (in the lower left of the polished photo) where it looks like there are very small holes and it didn't polish as well as the rest but the staining took place in a couple other areas along the outside. Should I just go back to the 280 and make sure I have everything done right and stains are removed after each wheel? Thanks Chris |
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Post by tribeunited on Sept 16, 2024 18:53:00 GMT -5
Wow!!! That turned out better than I expected! That banding is super pretty. Can't answer your questions, but I can oooh and ahhh.
ooooooh
aaahhhh
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Post by cabby on Sept 16, 2024 18:57:59 GMT -5
Wow!!! That turned out better than I expected! That banding is super pretty. Can't answer you questions, but I can oooh and ahhh. ooooooh aaahhhh I’m gonna ooh and aah too! And resist the urge to dig through my box of malachite to see if I have any that might cab up like that… Oooh! Aaaahhh! But seriously, that’s beautiful! And look forward to learning about potential issues! |
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Post by rockjunquie on Sept 16, 2024 19:15:45 GMT -5
Sorry - can't help. Gorgeous cab, though.  |
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Post by chris1956 on Sept 16, 2024 19:43:28 GMT -5
Wow!!! That turned out better than I expected! That banding is super pretty. Can't answer your questions, but I can oooh and ahhh. ooooooh aaahhhh Thanks for the ooooohs and aaahhhhs. Wow!!! That turned out better than I expected! That banding is super pretty. Can't answer you questions, but I can oooh and ahhh. ooooooh aaahhhh I’m gonna ooh and aah too! And resist the urge to dig through my box of malachite to see if I have any that might cab up like that… Oooh! Aaaahhh! But seriously, that’s beautiful! And look forward to learning about potential issues! Thanks. Sorry - can't help. Gorgeous cab, though. Thanks. |
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dshanpnw
fully equipped rock polisher
Member since December 2020
Posts: 1,173
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Post by dshanpnw on Sept 16, 2024 19:44:10 GMT -5
I'm not seeing much wrong with this beauty of a cab. I think you might be able to fix those small defects with a less coarse wheel, press very lightly. Nice job Chris.
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Post by liveoak on Sept 17, 2024 6:14:37 GMT -5
Makes me want to dig through my boxes & see if I have any malachite to cab !
Looks great from here !!
I'm wondering what the sludge is from ?
Hopefully someone with malachite specific experience will chime in
Patty
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Post by chris1956 on Sept 17, 2024 10:37:25 GMT -5
I'm not seeing much wrong with this beauty of a cab. I think you might be able to fix those small defects with a less coarse wheel, press very lightly. Nice job Chris. Thanks. I will keep that in mind when I get back to it. Makes me want to dig through my boxes & see if I have any malachite to cab ! Looks great from here !! I'm wondering what the sludge is from ? Hopefully someone with malachite specific experience will chime in Patty Thanks. The sludge has a green tint to it but I would call it more gray/brown. It seems to turn more green after a while (in puddles) which would suggest something else is settling out. I checked the streek color and it says light green so no idea wher the other colors are coming from. |
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Post by tribeunited on Sept 17, 2024 10:39:41 GMT -5
chris1956 - Hi again! I did some thinking about your staining issue - just had a few thoughts to share. - I washed all of the slabs, but not the preforms. - I know he sometimes used Pella Oil when cutting I was able to track down an sds of the oil he used - linkI'm not a scientist, but if you look at the chemicals listed on the sds, maybe you can figure out if any of them react to copper minerals. Other than those thoughts, I don't know why it might have had that sludge and staining. I'll also say I showed D that cab and he agreed - it's gorgeous! Take care Buddy!
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Post by chris1956 on Sept 17, 2024 12:16:20 GMT -5
chris1956 - Hi again! I did some thinking about your staining issue - just had a few thoughts to share. - I washed all of the slabs, but not the preforms. - I know he sometimes used Pella Oil when cutting I was able to track down an sds of the oil he used - linkI'm not a scientist, but if you look at the chemicals listed on the sds, maybe you can figure out if any of them react to copper minerals. Other than those thoughts, I don't know why it might have had that sludge and staining. I'll also say I showed D that cab and he agreed - it's gorgeous! Take care Buddy! Thanks. It basically indicates that it is a petroleum distalate (basically oil). I wouldn't think it was different than any other oil. If you read parts of the data sheets you would think that Pella oil is right next to pultonium for toxcity. But other parts read like what you might think for oil. Maybe that is why my skin is peeling off my fingers today (just kidding, I wore gloves and had a respirator on since there are other nasties in Malachite). By the way, that Malachite that D did was polished to perfection! |
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Post by tribeunited on Sept 17, 2024 13:31:01 GMT -5
chris1956 - No joke on that SDS! I am allergic to it too! The collector battled lung cancer - twice as a non-smoker. I know he had protective gear but I can't comment on their use. I'm not pointing the finger at this oil, I'm just saying chemicals and rock dust are a serious concern and I'm glad to hear you were safe. Keep making killer cabs - so gorgeous they melt faces. But don't melt your face or get killed doing it
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Post by rmf on Sept 17, 2024 15:23:40 GMT -5
chris1956 I can't see small holes or flat spot in the image so I could not recommend how far to go back. Flat spots are hard to get out of soft stones because they cut so fast especially on diamond. one trick I have used is to get some SiC sand paper and stroke it in the palm of your hand to get the flat out. the sludge is CuCO3 and CuO and what ever other is in the rock. error on the side of caution if you stick with the wheels go to 600 and use a very light touch and if you go to SiC sand paper try 400 and work it just enough to get the flat out. then finish as you have done. What I can see is you have a great polish. Also, Malachite frequently has little bubbles which you could save some sludge, dry it and mix with CA and fill the holes.
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Post by jasoninsd on Sept 21, 2024 20:34:23 GMT -5
chris1956 I can't see small holes or flat spot in the image so I could not recommend how far to go back. Flat spots are hard to get out of soft stones because they cut so fast especially on diamond. one trick I have used is to get some SiC sand paper and stroke it in the palm of your hand to get the flat out. the sludge is CuCO3 and CuO and what ever other is in the rock. error on the side of caution if you stick with the wheels go to 600 and use a very light touch and if you go to SiC sand paper try 400 and work it just enough to get the flat out. then finish as you have done. What I can see is you have a great polish. Also, Malachite frequently has little bubbles which you could save some sludge, dry it and mix with CA and fill the holes. Totally agree with going to the 600...or even the 1200 to see if you can get the flat spots out. (If you don't use the sand paper method suggested!) The Malachite I've worked is SOOO freakin' soft that I think even the 600 might be pushing back too far! Let us know how it turns out chris1956! |
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