Lapidaryforum.net
Let's Rock => Rock Talk => Topic started by: Gemscholar on September 04, 2017, 10:21:51 AM
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Can anyone tell me if Rainbow Calsilica can be cast in place, using Lost wax method, and centrifugal spin casting?
Before I ruin some cabs, Id sure would appreciate anyone's opinion here., Thanks all
Krupp
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I suspect you will be the one to tell the rest of us. I would try aiming a torch at a piece of scrap first to see how it reacts.
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So... i applied some flame from an Oxy Acetelyne rig, light bushy flame, not too hot, Burnt the Calsilica to a cinder in less than 30 seconds!!!
Well, that answers that. HAHA. :laughing6:
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My understanding is that is one of those manufactured "rocks". I know they call it natural like all the koolbaugh material that is full of glue. But it is damn pretty stuff and makes nice cabochons.
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https://www.youtube.com/watch?v=V4rP9T1YW-Y
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I think the video presents what may have been the original source (glaze runoff from a tile factory). I also strongly suspect that most of the current supply is hardly "accidental" and no longer out of Mexico, but instead manufactured on-demand from Asian sources. Even 5-6 years ago I recall seeing clean block chunks being offered that looked like they'd never been anywhere near the dirty conditions of an industrial dump. Just a variation on the formulas and methods used to reproduce fordite, block turquoise, etc., IMO. One of the easier and cheaper materials for them to replicate on demand (despite the nonsense about "forbidden" pigments "no longer available" sellers use to justify high prices - we're talking about countries where there are almost no regulations).
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could we not make our own "fordite"? i have old paints in various amounts stored for "when ever". any ideas on how to go about this? what's the difference between auto paints and house paints? or better paints to use. what about stains? what about artist acrylic paints and oil paints? i'd really like to hear input on this.
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could we not make our own "fordite"? i have old paints in various amounts stored for "when ever". any ideas on how to go about this? what's the difference between auto paints and house paints? or better paints to use. what about stains? what about artist acrylic paints and oil paints? i'd really like to hear input on this.
Automotive paint is made to be super hard and non porous. These are enamels and laquers. Wall paint is made to be soft and not chip. It is also porous. House paint is meant to actually chalk with age. These are a completely different type of product to say nothing of the enormous difference in cost.
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Fordite??? Old automotive paint was much different than todays. Yep, full of toxic stuff that made the paint hard, last and not fade. So, we still might be able to make it. A little car paint and steal your kids easy bake oven up in the attic. neal
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Today's automotive paints are far superior in hardness and durability to older paints (which technologies are still available). Until the mid-1920s, autos were painted using multiple thin coats of brushed-on linseed oil paint (basically same as the house paints of that time). In luxury models a combination of paints and varnishes were developed. These finishes lasted only a few years in regular outdoor use. This changed with the development of nitrocellulose lacquer (used mid-1920s to 1970s), which coincided with adoption of spray-on application. From the 1930s to 1970s, alkyd enamels and acrylic lacquer were also used (again through the 1970s). Dulling and fading were also a problem with these materials in real-world UV exposure. First in Europe, and then by U.S. manufacturers (in the 1980s), polyurethanes and acrylic urethanes replaced earlier formulations, and are basically what are still in use today, although there has been a steady reduction in volatiles and an increase in UV resistance.
Pigments represent the non-volatile toxic substances in both older and newer automotive paints (as they are in all paint). With the exception of lead (pb), toxic pigments are still used. Even lead pigment is only banned in house paint in N. America and Europe (still allowed in some other paints and coatings), and is still widely used in some nations.
Some manufacturers are now offering auto wraps for some color options, so perhaps all auto paint will become a thing of the past. As lacquer/varnish and paint technologies date back over 6000 years, I expect that it will still be easy enough for someone to replicate old finishes and "accidental stones" like Fordite and Calsilica whenever there is the slightest potential to turn a profit.
A little car paint and steal your kids easy bake oven up in the attic. neal
That thought had occurred to me, too. Getting hard to find the 60 watt incandescent bulbs to power those ovens, though :grin:
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i have always believed that we can think, we can do and we can create anything with a little ingenuity, skill, luck and even some help. i still do at my ripe age. fordite sounded easy and sounded like fun to make. a simple "its very or extremely toxic" would have done and i thank rock2dust for a fuller explanation.
this forum is great, i believe everyone smart and not so smart, everyone educated and non educated, i believe in enjoyment and friendliness and friendly competition, and i believe all questions and inquiries no matter how ignorant or intelligent should be replied to with tolerance and respect. mary..
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Not sure if I might be the intolerant one.. sorry
:occasion14:
But roccks2dust did state that "With the exception of lead (pb), toxic pigments are still used". I do not know the specifics but that was my understanding. I worked with Ford, GM and other auto parts manufacturers while I live in southern Michigan and have been through many auto plants, steel mills and parts manufacturing plants. I saw the pollution first hand and watched the Rouge River turn into a Sewer. So, yeah, I will try and get off my horse for a bit. Just want everyone to be safe. neal
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If you want some "fordite" go to a local automotive paint shop and ask if you can have the globs of paint that accumulate in their paint booth/curing rooms. They usually are happy to have their equipment cleaned up a bit. Specially when you go back and Give them a couple finished pendants as thanks. You end up with a source for life! And the colors vary every time.
To make your own calsilica, buy a bunch of colors of pottery slip and build/make your own. Just get a pottery place to bake it for you when done.
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"fordite" good idea on the automotive shop. we have a place here that makes aluminum tire rims. could the spray paint they use on the rims work the same way? i worked in the automotive paint shop for a very short period, 20 years ago, so do not remember the cleaning part of it other than having to wear white overalls with covered head, googles and a face mask.
"calsilica" i did pick up some clay from a local pottery shop and can make my own slip (youtube). i also picked up a kiln, both bought earlier this summer. once my daughter rewires it, i can learn to bake it myself. thanks for the ideas. just need to think about what dyes i would want.
safety first, always :occasion14:
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Man-made? Is this the same as Rainbow Calsite? From a mine in Mexico that I have seen a picture of a guy standing next to a seam in a rock wall as tall as he was?
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Man-made? Is this the same as Rainbow Calsite? From a mine in Mexico that I have seen a picture of a guy standing next to a seam in a rock wall as tall as he was?
Please post the photo or a link to the photo.
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There are some interesting Rainbow Calsilica images at this link:
https://www.google.com/search?q=rainbow+calsilica+fake&tbm=isch&tbs=rimg:CbUM8quq3LxzIjjygvSbiaWDOMyaBgt6kndVwpbuQ941ARtBhke2vHLFDAgeKZfNnKGdFcjQLZLxezRqg3R3HIBsLioSCfKC9JuJpYM4EbZIKraAIJTIKhIJzJoGC3qSd1URcrg15dNW5wgqEgnClu5D3jUBGxF68BB7IDfZUCoSCUGGR7a8csUMEbkrf1H-3Y4oKhIJCB4pl82coZ0RqID7vJN-TOAqEgkVyNAtkvF7NBGh-QnQ-euwmSoSCWqDdHccgGwuEZlxMr8fNeHh&tbo=u&sa=X&ved=0ahUKEwjN34W7_MPWAhUY6WMKHY7PDsYQ9C8IHA&biw=1097&bih=480&dpr=1.75
Take particular note of the 4th image down on the left -- the one with the bottle cap imbedded in this "natural" material.
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Like I said, picture that I saw in a cab class I was in two years ago. That's why I was curious if we were talking the same thing since I thought it was a completely natural material from a single mine in Mexico. My instructor even went so far as to explain how they managed to stabilize it there which was one of the reasons it was so expensive.
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Like I said, picture that I saw in a cab class I was in two years ago. That's why I was curious if we were talking the same thing since I thought it was a completely natural material from a single mine in Mexico. My instructor even went so far as to explain how they managed to stabilize it there which was one of the reasons it was so expensive.
Here's a couple of links that might interest you:
http://www.professionaljeweler.com/archives/articles/2003/sep03/0903gn2.html
http://gemaddicts.com/?p=615
I guess I'm a natural-born skeptic and the fact that Colbaugh's investigator wasn't allowed access to the mine itself tells me everything I need to know.
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Yeah, it's pretty much settled that this is man made, possibly from industrial run off as opposed to deliberately made, at least originally, but nonetheless, not natural.