Yes, black fiberglass tissue can be used for insulation in walls. It is a type of fiberglass insulation that is often used in residential and commercial buildings due to its effectiveness in reducing heat transfer and providing thermal insulation. Black fiberglass tissue is made from glass fibers and has a high resistance to heat flow, which helps to maintain a comfortable temperature inside the building. It is also known for its durability and resistance to moisture, making it a popular choice for wall insulation. However, it's important to follow proper installation procedures and safety precautions to ensure the insulation's effectiveness and to protect against potential health risks associated with fiberglass.