Polyethylene glycol (PEG) is a synthetic, water-soluble polymer used in a wide variety of applications, from pharmaceuticals and cosmetics to industrial processes. It is not inherently corrosive to metals or skin as it is a neutral, inert substance with no significant reactivity. The corrosiveness of a substance typically relates to its ability to degrade or damage other materials through chemical reactions. Since PEG does not participate readily in such reactions, it does not pose the same threat of corrosion as acids, bases, or oxidizing agents do. However, in industrial settings, the formulation in which PEG is a component could influence corrosion if other ingredients are corrosive. Always consult safety datasheets for comprehensive information on handling and potential risks.

Coating jewelry is a technique used to protect and enhance the appearance of pieces. Common coatings include lacquer, clear nail polish, and specialized jewelry sealants. To coat jewelry, first, clean the piece thoroughly with a gentle cleaner and dry it completely. Next, apply the chosen coating evenly, following the product's instructions. Lacquer or sealants may require a brush for application, while clear nail polish can be directly applied. Ensure the area is well-ventilated and allow the piece to dry fully before wearing. Multiple thin coats may be needed for optimum protection. This method is especially beneficial for costume jewelry to prevent tarnishing and skin discoloration.

Spinning gradient yarn requires understanding color transition and fiber blending. Begin by selecting fibers in colors that gradually shift from one to the next. Divide your fibers into even portions to ensure a consistent transition. Next, carefully blend the fibers at their edges to create a seamless color gradient. This can be achieved by carding the edges together or lightly hand-mixing them. When spinning, start with the first color and gradually introduce the blended portion, moving to the next color, ensuring the transition is gradual and smooth. Maintain consistent tension and treadling speed to ensure even yarn thickness. It's a creative process that allows for experimentation with color and fiber, leading to unique, beautiful yarns ideal for knitting or crocheting gradient projects.