Back when I was in high school, I just stuck things in 70% isopropyl. but as I've learned, things decay in iso over time. It worked great (3 years + no discoloration) on a frog I had that escaped, and then pretty much mummified itself in the dry house. I know it's best to inject and fix in formalin. I could get some formalin, but I don't have any safe place to use it and no idea how to dispose of it. I was wondering if there were any other chemicals that are effective for fixing (before transferring to iso)? I've even tried fixing in 90% iso first, but I've found it degrades things quicker. I can't find any info online about this, aside from some offhanded things like "wet specimens are sometimes perserved in a, b, or c" with no more specific info. Any help appreciated. I've got lots of feeder mice and rats in the feezer that are too old for my snakes (but not in any state of decay--I skinned one of them for some experimental taxidermy, and it didn't have green belly or loose skin or anything. At most, some are freezer burned.) I'd like to be able to do something with them.