Washing off the coarse black powder that forms on newly seasoned (smoked) cast iron before cooking something in it for the first time can be beneficial for several reasons:
Residue Removal: The coarse black powder that forms during the initial seasoning process can contain excess oil or other impurities. Washing it off ensures that any leftover residue is removed, leaving you with a cleaner surface to cook on.
Avoiding Unwanted Flavor: The initial seasoning process often involves heating oil or fat to create a protective layer on the cast iron. Some of the oil used in the seasoning process may not fully polymerize and could leave a slightly off-flavor in your food. Washing off the powder helps reduce the risk of your first meals absorbing any unwanted tastes.
Improved Non-Stick Performance: While the initial seasoning helps create a non-stick surface, it might not be as effective immediately after the first seasoning. Washing off the coarse powder and then applying subsequent layers of seasoning can result in a smoother and more even non-stick surface.
Enhanced Seasoning Process: Some cast iron enthusiasts prefer to apply multiple layers of seasoning to build a strong and durable non-stick coating. Washing off the coarse powder between each seasoning layer allows for better adhesion and a more effective seasoning process.
Prevent Smoke and Odor: The coarse black powder can generate smoke and odors when the cast iron is heated for the first time. Washing it off can help minimize smoke and prevent any potential unpleasant smells during your first cooking sessions.
If you decide to wash off the coarse black powder, you can do so with warm water and a mild detergent. After washing, make sure to dry the cast iron thoroughly to prevent any moisture-related issues.
Keep in mind that the process of seasoning and maintaining cast iron cookware is a personal preference, and there are different approaches to achieve great results. Some people might choose to leave the coarse powder on and cook directly on the cast iron to build up additional seasoning layers naturally over time. Experiment with different methods and find what works best for you and your cast iron cookware.