Well gunny this is a classic error. You have used too much of the solution in your haste to get things done, you should only have the application cloth/sponge just moistened you have had the barrel ruining in the solution allowing the Copper Sulfate in the solution to plate the steel. Remove the Copper plating and start again using a barely damp application cloth and things will improve. Take a look at Larry Potterfield's video on u tube he goes through the whole process of how to rust blue.

The only lessons in my life I truly did learn from where the ones I paid for!