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  1. Hello again! I have done my first experiment with Butvar 76 after drying my Green River fish fossils for 15 days. For this first experiment I selected a thin partially complete Diplomystus from the lower quality end of my haul last month. I gently blew compressed air over the fossil which had been picked lightly with a dental tool, then applied my mix of Butvar-76 and acetone. I found different recommendations for the ratio, and probably used to much powder in my solution because as you can see, upon returning from work I found that small bubbles were trapped inside. I assume the surface tension was too high to allow them to escape as a result of using too thick Butvar. For my next experiment I will thin it out, and brush on thin coats and apply them one at a time instead of thickly applying it. I also noticed that some of the stone dust washed into the solution above the fossils midsection in the depressions between the thin bones. Feel free to critique my first attempt and give any advice.
  2. In Pennsylvania USA, in the Old Port Formation, some trilobites are exposed in the scree and talus below coarse sandstone horizons. They tend to be very fragile (image below). My question is..... what's the best way to open large hunks of this rock, hoping for intact fossils within? I'm thinking about trying freeze thaw, but opted to check in here for alternatives or helpful tips. Anyone? Thanks!
  3. I have read the bits here and elsewhere about DMSO. I'm not that serious and I'm not sure that's what I'd want anyway. Being new and my first post, I hope it's in the right place. I have some sandstone which was a big clump. Fairly beat up from being in Lake Michigan. I looked and decided to crack it open and see what's inside. Now I have a few pieces and I see some interesting fossils, but they look like the same material, nearly, as the surrounding sandstone. I can only guess that if I try to dissolve the sandstone, I'll probably also dissolve the fossils? These look like shells or outer shells of assorted ancient sea life. With a smaller chunk, I've been putting it into a campfire burner two nights after the fire is going down. I figured heat cracked rocks from archaeology why not try some baked sandstone? Here's a before which hopefully will show what I have. I have some tools, chisels, and a couple of old dental picks. I'm not sure if that's the right way to go. And I wonder if some solvent, over a period of time, sitting out in the garage, might work on the sandstone? Again the acid idea doesn't seem like a good one, whether it's Hydrochloric acid or acetic or something else, the fossils seem like the material is too similar and I'll just end up with a bucket of mush? Anyone with some experience have a starting point to share? Thanks
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