Diaphonization is the scientific process of clearing soft tissue and staining bone & cartilage. This process is used to examine delicate, organic material. This is a very delicate, finicky process.
These legs were from adult mice. Each leg will come in a 2 inch glass vial, submerged in a harmless preservative. Colors and vibrancy will vary.
All mice were byproducts of the reptile feeding industry. These mice were to be discarded by reptile breeders, pet stores, and rescues for various reasons.