This mod is no longer supported. All of its features have been improved and ported to Immersive Weathering which you can view and download HERE
This mod is fairly small and quite simple. It adds Plate Iron (which can be crafted with 4 Iron blocks in a square) and Cut Iron (which can be crafted with 4 Plate Iron in a square or in a stonecutter).
Plate and Cut iron will rust over time, similarly to Copper. However, To progress into further stages of rustedness, the blocks need to come into contact with rain or water blocks. Once Plate or Cut iron have been rusted, it is impossible to remove the rust. However, if you wax the iron blocks with a honeycomb item, they will remain in that stage regardless of water. You can use an axe to remove the wax just as you would on waxed copper. Both Plate and Cut Iron and all of their rust stages also have a full set of Slab and Stairs variants.
This mod is only available for Fabric at this time.