Hobby Lobby, known for its wide range of crafting and art supplies, typically stocks a variety of inks suitable for various artistic needs. While the specific inventory can vary by location and time, Winsor & Newton, as a reputable brand in the art world, often has its products, including gold ink, available in well-stocked art supply stores. Hobby Lobby has carried Winsor & Newton products in the past, so it's quite possible they have the gold ink. However, it's always best to check the current stock either by visiting their website, calling the nearest store, or checking the Hobby Lobby app for the most accurate and up-to-date availability. If Hobby Lobby does not have this specific ink in stock, they often offer alternatives that could suit your needs, or you can explore other art supply stores or online retailers.

Glycine is classified as an amino acid because it meets the basic structural criteria characteristic of amino acids: it contains both an amino group (-NH2) and a carboxyl group (-COOH) attached to the same carbon atom, known as the alpha carbon. What makes glycine unique among the 20 standard amino acids is its side chain, which is a single hydrogen atom, the simplest of all side chains. This simplicity allows glycine to fit into tight spaces within proteins, making it highly versatile in biological processes. Despite its simple structure, glycine plays critical roles in the central nervous system, the construction of proteins, and various metabolic pathways. Its ability to serve as both an inhibitory and neurotransmitter, as well as a precursor to several significant biomolecules (like glutathione, collagen, and creatine), underscores its importance in human health and disease.

Breaking a PVC weld, a bond created through solvent welding where the solvent chemically fuses two PVC pieces into one, can be challenging due to the strength of the connection. Ideally, it's best to avoid having to break a solvent weld by planning and dry fitting before the final application. If breaking the weld becomes necessary, mechanical cutting is the most feasible option. This includes using a fine-toothed saw, a rotary tool, or a PVC cutter to carefully cut through the welded joint without damaging the surrounding material. It's important to note that once cut, the integrity of the original PVC pieces is compromised, and they likely won't be usable for the same application. Considerations for safety, such as wearing protective eyewear and ensuring a stable cutting environment, are paramount. Unfortunately, there are no chemical solvents or easy methods to "undo" a PVC weld, as the process is designed to be permanent. In some cases, heating the welded area with a heat gun might make it more pliable, but chances of successful separation without damage are slim.