The grain size of the iron powder can be mixed with Plasikret or acrylic lacquer, among others. It can later be patinated like iron. After treatment with, for example, hydrochloric acid or iron nitrate, a beautiful rusty brown / orange colour develops. Can also be used to make magnetic fields visible. Keep the magnet under a glass plate or paper, otherwise you will not be able to clean the magnet.
Iron powder with an average sieve size of 200 μ. Is slightly greyer than iron mortar and also more susceptible to rust.