We believe Lab Technicians and science Teachers are subjected to enough chemical exposure during their career as it is. Students, too, deserve to learn in an environment that limits their chemical exposure to those experiments that require the use of chemicals in a controlled and safe manner.
The specimens supplied by Dissection Connection are 100% chemical preservative free. No formalin, no glycol, no nothing. The exception are the small intestines which are packaged in a solution of sterile 0.9% saline to prevent dehydration of the specimen.
The piglets are just too difficult to pin to a board in the tradition way for dissection. Heather from Southern Biological showed me this elastic band method between sessions at a conference one day.