Final answer:
Light flash rusting is described as small quantities of yellow or brown rust that do not obscure the steel substrate.
Step-by-step explanation:
The degree of flash rusting that is described as small quantities yellow or brown in color that do not obscure the steel substrate is Light flash rusting. In this case, the rusting is minimal and does not significantly affect the appearance or functionality of the steel substrate. It is important to address the rusting promptly to prevent further corrosion.
Learn more about Flash rusting