A Gadolinium Triacetate based stain as an alternative for Uranyl Acetate stain. Delivers comparable results without the authorization, shipping and disposal issue involved with Uranyl Acetate. Uranyl Acetate alternative is a non-radioactive stain; supplied as a concentrate. Works well for staining of plastic embedded animal and plant materials and a negative stain for macromolecules. Not recommended as a fixative.