Our new Formaldehyde-Free Preservative binds with specimen tissue as non-toxic, cross-linked proteins, making the solution truly 100% formaldehyde free. Absolutely no formaldehyde whatsoever is used in the fixing and preserving process for these specimens. Our preparations: Plain - Preserved Formaldehyde-Free Preservative Single - Arteries injected with red latex Double - Arteries injected with red latex, viens injected with blue latex Our Packaging: Vac-Pak: Vacuum packs are easy to handle and minimize disposal concerns Pail-Pak: Pail packs provide long term storage and give you a secure holding container