Transparent Specimen 3D Dual Layer Puzzle (Oval Squid) by Megahouse What are transparent fish specimens? They consist of magenta colored bones and blue colored cartilage. They are colored after proteins being transparentized with enzymes. These specimens are not only interesting academically, but also beautiful as art pieces. 3D puzzles featuring transparent fish specimens These puzzles also make great decorations. They reflect light well and offer a different look from every angle.