Which material can sodium sulfide NOT be used on?

Sodium sulfide is a chemical compound commonly used in various applications, including the removal of lead-based paint and other heavy metals. It works primarily through a process called sulfide precipitation, where it reacts with lead to form insoluble lead sulfide complexes that can then be removed.

When evaluating the materials listed, it is important to consider the interaction of sodium sulfide with these surfaces. Plaster, typically composed of gypsum or lime, can be sensitive to chemical reactions that may alter its structure. The use of sodium sulfide on plaster could lead to unwanted effects, such as damage to the plaster itself or the aesthetic and structural integrity of the surface.

On the other hand, sodium sulfide can be effective on wood, glass, and brick. Wood can be treated with sodium sulfide, particularly in paint removal, without significant damage if done carefully. Glass generally does not react with sodium sulfide and can be cleaned effectively. Brick, while porous, can also withstand treatment with sodium sulfide, as long as precautions are taken to avoid excessive absorption or staining.

Thus, the indication that sodium sulfide cannot be used effectively or safely on plaster underscores the need to choose appropriate chemicals based on the material involved. This highlights the principles of material compatibility and