What term describes the material that mixes with the penetrant and enables removal by washing?

What term describes the material that mixes with the penetrant and enables removal by washing?

• A. Emulsifier
• B. Developer
• C. Solvent
• D. Surfactant

Answer: (A)

Emulsifier is the material that mixes with the penetrant to form an emulsion that can be washed away with water, enabling removal of the penetrant while leaving indications visible. This agent lowers interfacial tension and allows the penetrant to be carried away by the wash water, so excess penetrant doesn’t obscure flaws. The developer comes after washing to reveal indications, not to enable washing. A solvent is used for solvent-removable penetrants, not for water washing. A surfactant is a broad term for surface-active agents, but in this context the specific term that enables wash removal is emulsifier.

Emulsifier is the material that mixes with the penetrant to form an emulsion that can be washed away with water, enabling removal of the penetrant while leaving indications visible. This agent lowers interfacial tension and allows the penetrant to be carried away by the wash water, so excess penetrant doesn’t obscure flaws. The developer comes after washing to reveal indications, not to enable washing. A solvent is used for solvent-removable penetrants, not for water washing. A surfactant is a broad term for surface-active agents, but in this context the specific term that enables wash removal is emulsifier.