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Found 5 results

  1. Stages of fossil prep

    I love the process of discovery, removal and cleaning of fossils. I enjoy just looking through my picture of them as they see daylight for the first time. So, in that thought (and since I'm stuck at work and cant be in my prep lab) I thought I would share the piece I have been working on lately. This is a rib head of Edmontosaurus as uncovered and before removal. Hell Creek fm, Butte Co, South Dakota. Below on the right you can see a main rib section just started to be uncovered. The main section was actually found first, and then the rib head was found as I began removing the covering matrix. The the rib head as best as could clean by manual methods. You can see it has large glued-matrix cracks, and the surface has a "dull" appearance caused by micro matrix and glue filling the details. You can also see the extensive pre-deposition erosion with lots of cancellous tissue exposed. This is after air-abrasion with bicarb. I had to use an air-scribe to remove tough bits of CA and matrix. The back side (not shown) had a large area (almost all of it) covered with CA. I had to use acetone on Q-tips and a dental scraper to clean most of it off. Although it seemed that after treatment, even if a layer remained, it was fairly easy to blast off with the bicarb. Although a lot more natural detail is now present, so is the extent of erosion and cracking. Before the last step, I applied a good amount of PVA consolidate to help solidify the structure. I also worked down matrix that was glued inside the large cracks. I didnt remove it, just cleaned it down so there was room for the putty. The CA-matrix mix is a good stabilizer so I didnt see the need to remove it completely, especially since I probably would have split the fossil on accident. Then I began filling the cracks and holes with PaleoSculp. Lastly I put a layer of putty inside the "overhang" that was so badly damaged. I know there is a lot of artistry in applying epoxy putty, texturing, etc. I just happy to get a solid layer without breaking off a section of that thin crown. If you compare the first 2 images with last 2, you'll see a "finger" of bone sticking off right end, to the side. Thats a bit of that "crown" ridge. I removed it and I'm cleaning and separating to bits so they can be glued back in place correctly. A tiny detail, but since I have it, I felt I should keep it intact. I gave a lot of thought to recreating the missing tubercle (a bump off the top of the curve), but they change size and shape with different rib placement. I also wanted to recreate the missing tip of the head. But in the end I opted for "less is more" and decided to leave it as found. The next prep will be the rib main section. It doesnt have the exposed inner bone, but its highly fractured so I will have to separate lots of pieces, clean the matrix out before gluing back together. I'm really worried about its structural integrity, so I will probably blast the surface clean then consolidate before I begin working the cracks.
  2. Removable Filler Putty

    I have been working on a larger prep project and i have been brainstorming ideas for how to deal with a crack that formed when prepping. The crack is between two halves of bone and they are not as close together as they could be. I have considered re breaking the two halves and then re gluing but after thinking on it awhile, im not sure i will be able to get the two halves any closer together than they already are. So for display im thinking i will fill the crack with some sort of putty that conceals this crack. My concern is just that later on, if this piece ends up in a museum collection and someone wanted to reverse this and join the two halves in tighter alignment, they would be able to remove this putty or whatever was used without to much trouble. I have used a number of different putty's but im not aware of any removable ones. Im looking for any suggestions for removable putty's or alternate crack filling solutions. Thanks, Nick
  3. Painting epoxy putty

    Hi guys, I’m rebuilding some matrix on an ichthyosaur block I've recently acquired. What paint type do you use for colour matching? ta John
  4. Removing putty-like adhesives

    I am wanting to remove this shark tooth for photography purposes, but it is attached to the display case via some putty-like adhesive. I haven't tried poking at it in fear of damaging the tooth (which is quite brittle), but it does appear to be somewhat hardened, although I may be wrong. Does anyone know how to best remove putties using household materials with minimal damage to the fossil? Any help is appreciated.
  5. Greetings, I recently bought a beautiful Spinosaurus tooth that was previously restored as some parts were obviously broken and put together with some sort of brown putty which looks like dirt or rock fragments. The problem is that the tooth had an accident a few days ago (it fell from the stand) and it broke again. I put the parts together with super glue but the cracks are now wide and visible and I would like to hide them a little bit by using some putty or resin, I don't want the tooth to look perfect and unbroken, just to look like before it fell, like there is some dirt or rock fragments instead of cracks. Do you have any tip about how to do that? Any brown putty or resin? Thank you very much.
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