Ink fingerprinting is a method used to capture an individual's unique fingerprint patterns. Start by ensuring you have the necessary materials: a standard ink pad with high-contrast ink (usually black), a set of fingerprint cards, and a clean surface. Before taking fingerprints, clean and dry the person's fingers to remove any dirt or oil. Press the person's finger onto the ink pad, ensuring even coverage, and then roll it from one side to the other on the fingerprint card. This action aims to capture the whole fingerprint, including the sides. Apply gentle pressure to avoid smudging. Repeat the process for each finger, using separate sections of the ink pad if it becomes too saturated. It's important to clearly label each print on the card according to its position (thumb, index, etc.). After all fingerprints have been taken, allow the ink to dry thoroughly to prevent smudging. Ensure the workspace is well-lit and the person remains relaxed throughout the process for the best results. Clean the person's fingers with a wipe or soap and water once completed.

Polymers are large molecules composed of many repeated subunits, known as monomers. These monomers can be sourced from various origins, broadly categorized into synthetic and natural polymers. Synthetic polymers, such as plastics and synthetic rubbers, are derived from petrochemicals through polymerization processes in factories. On the other hand, natural polymers originate from biological entities; for example, cellulose is obtained from plants, proteins from animals, and DNA from all living organisms. The creation and transformation of these monomers into polymers can involve numerous chemical reactions, including addition polymerization and condensation polymerization, depending on the types of monomers and the desired properties of the resulting polymer.

Polypropylene molecules are formed from propene molecules through a process known as polymerization, specifically chain-growth polymerization. Propene is a monomer that contains a double bond, allowing it to react and form long chains. The process typically involves a catalyst, such as a Ziegler-Natta catalyst, which facilitates the joining of the propene molecules while controlling the polymer's molecular structure. As propene molecules join, their double bonds open up, enabling them to connect end-to-end, forming a long chain of polymer, known as polypropylene. This polymerization can be tailored to achieve desired properties in the polypropylene, such as strength, flexibility, or crystallinity, by altering reaction conditions or using different catalysts.