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.
You may as well just cook it in the microwave. Place the potato directly on the oven rack. Bake for 40 to 60 minutes, depending upon the size of the potato. Potatoes are as hard as a brick when they are raw.By the time itâs cooked youâll be able to squeeze it.lace the potato directly on the oven rack. Bake for 40 to 60 minutes, depending upon the size of the potato. Potatoes are as hard as a brick when they are raw. By the time itâs cooked youâll be able to squeeze it.