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I started off rinsing with water until I realized it was causing all the fine detail to disintegrate away (I saw little suction cups on the tentacles!). I think it'a pyrite disease? Is it? I dunked it in a bowl of vinegar and it it still there now, hoping to stop the water damage and it seems to have halted the rapid deterioration, but now I'm concerned about the acid causing damage. What should I do next? I read online that a phosphate treatment may replace the escaping sulfur and stop the oxidation and that a recommended field treatment would be common fertilizer. How the heck would I apply fertilizer to a fossil? I do have some chemicals in the house for art in furniture restoration, but definitely not pure phosphate. Again, this is foreign territory. Any help would be greatly appreciated, thank you all! Location: Annandale, Virginia within the Virginia Gold-Pyrite Belt. My neighborhood is in the Cambrian period, but there was a geographic displacement from the Blue Ridge Mountains into Northern VA, not sure how/if that figures into the scenario.