Can you post a pic? Many people (myself included) will leave wedges outside in the rain for a few weeks before playing them so they get nice and rusty.
Another way is to put the (non chromed) blade in a zip lock with a couple of damp, salty, paper towels for a few days. After a few bunker shots though, the rust sloughs off
I wanted to further rust my Cleveland 588 RTG's. I wrapped a damp rag around it and it got rusty, but with even a washing the rust washed off..?!? I then left it overnight in Coke and it worked really good, but after a washing the rust washed off again. Just letting it rust on it's own now.