How are dry developers applied?

How are dry developers applied?

• A. After drying process, dry powder is light and fluffy and clings to the surface in a fine film
• B. Before drying process
• C. By dipping in a liquid solution
• D. By brushing dry powder onto surface after moisture removal

Answer: (A)

Dry development uses a fine, dry powder that is applied to a surface that has been thoroughly dried. The powder is light and fluffy and forms a thin, uniform coating that clings to the surface. This dry film acts as a blotter, drawing penetrant from any surface-connected flaws to the surface, where the indication becomes visible under appropriate lighting. The key idea is that the developer is a dry powder applied after drying to create a thin film; applying it before drying, dipping in a liquid solution, or brushing after moisture removal would not produce the correct dry-film indication.

Dry development uses a fine, dry powder that is applied to a surface that has been thoroughly dried. The powder is light and fluffy and forms a thin, uniform coating that clings to the surface. This dry film acts as a blotter, drawing penetrant from any surface-connected flaws to the surface, where the indication becomes visible under appropriate lighting. The key idea is that the developer is a dry powder applied after drying to create a thin film; applying it before drying, dipping in a liquid solution, or brushing after moisture removal would not produce the correct dry-film indication.