Correct option is B
Prussian blue oil paint is commonly used as a
marking medium for
drawing clear and sharp lines on metal surfaces. It forms a thin, uniform, and highly visible layer, making it easier to scribe precise lines for machining or fabrication tasks. The blue color provides a good contrast against the shiny surface of metals, ensuring clear visibility of the markings.
Properties of Prussian Blue:
· Dark blue in color, offering high contrast.
· Smooth, thin layer that does not peel or flake easily.
· Used in layout work, particularly in machining and fitting shops.
Application: Applied with a brush or cloth over the surface to create a thin, even coating before scribing.
