Thaw out dozen herring, usually sits out, might hurry the process with cold water (only cold).
In the mean time I dissolve 1/2 cup salt (I use rock salt) to about a quart of hot water (make sure to let solution cool completely before adding herring).
You can experiment with food coloring (I use green) and if you like scents include it in the solution. I do all this the night before I'm on the water.
Experiment with the recipe to fit your needs. Also I use procure scents with the injector as I'm baiting up I'll pump the herring with as much scent as I can get in it.
Good Fishing............><>