A pigment stain is a type of discoloration that occurs when pigments deposit onto a surface, such as fabric, skin, or other materials. Pigments are substances that reflect specific wavelengths of light and absorb others, giving them their characteristic colors. These stains can originate from natural sources like plant dyes or synthetic ones used in paints, markers, and inks. Pigment stains often require specific cleaning methods to remove effectively without causing damage to the stained material. For instance, treating ink stains on fabric might involve using alcohol or specialized cleaning agents, while removing a stain from a piece of art may require more delicate conservation techniques.

Disassembling PVC pipe, typically glued together in plumbing systems, requires careful handling to avoid damage. If the goal is to salvage the pipe or fitting, heating the joint with a heat gun can soften the PVC cement, allowing you to carefully twist and pull the parts apart. However, this method runs the risk of damaging the pipe or fitting due to the high heat needed. Cutting the pipe is often a more straightforward approach when preserving the pipe isn't necessary. A PVC pipe cutter or a hacksaw can be used to cleanly cut the pipe close to the joint, allowing for the removal of the unwanted section. After removing the section, a coupling can be used to reconnect any remaining pieces if the system needs to be reused. Always wear safety gear, such as gloves and goggles, to protect against potential hazards while working.

The phrase "does ink jet run" seems to inquire about the operational capability of an inkjet printer. An inkjet printer works by propelling droplets of ink through a print head onto paper, creating text and images. To operate, the printer needs to be connected to a power source and a device (like a computer) that sends print commands. Ink cartridges must be filled or replaced when empty. Regular maintenance, such as cleaning the print head, is essential to keep the printer running smoothly. If the printer is not functioning, issues could include clogged nozzles, low ink levels, or hardware/software malfunctions. For optimal performance, users should follow the manufacturer's guidelines and use high-quality ink and paper.