Acid and Copper Solution. 1  1. Ensure that the metal you are working with will rust. 2  2. Measure some hydrochloric acid into a plastic bottle. 3  3. Dissolve a bit of copper in the hydrochloric acid.  4. Dilute the copper and acid solution with 1  water. 5. Clean your steel or iron thoroughly.  6. Apply the acid 1  solution. 7. Allow the metal to  rust.
Quick Answer. Depending on size, potatoes should bake in the oven for around 50 minutes to 1 hour. Flipping the potatoes every 20 minutes during the baking process helps to ensure consistent baking throughout the entire potato. Continue Reading.
7- Put the potato over a cookie sheet or baking pan and place it in the oven. You can put the potato directly on the rack but I would advise against it as it can get messy. Once inside the oven wait around 30 to 40 minutes to turn it over to ensure all parts of the potato are cooked properly. 8- At this point you should have a good idea on how to bake potatoes. When the time is up, use a fork to pierce different areas of the potato.