My first post here! I’m so excited to be a part of this community. I watched a video of etching with salt and copper sulfate on cold-rolled steel. However, I ended up with mild hot-rolled steel by mistake. How much of a difference would this make when etching with the copper sulfate/salt combo? Would Ferric Chloride work better? I have no experience with steel (as you can tell). Any other ideas? Thank you!