I am with Chris on this. I have used my joining slip recipe to build up areas and then underglazed them before going to bisque. I have also knocked off a piece and reattached it using the joining slip, saving a lot of work.
Copper sulfate is an active ingredient in root killers, it may be the only ingredient other than inert filler.
I am not sure that copper nitrate is what you want...quoted from an article "Cupric nitrate is a strong oxidizer which can cause burning and explosive if heated, rubbed or impacted with carbon powder, sulfur or other combustible materials"
I am keeping up and with your advice watching for clues to help my art festival activities. I agree on the Hawaiian truck too, but fortunes can turn suddenly.
I have been in the middle of the one street festivals for all except two shows. At one show I was on a side street next to the portable restrooms and across from the kid's play area...definitely not the best location. It soured my wife on this show forever, so we don't go back there; even to look. At my last show this year I was at an end of a one street, lined both side show. This particular show I was expecting to do exceptionally well, it was close to my home, had the right demographics for me, etc. The stars were aligned, I thought. Then came the show. Being at the end I saw the people come in, take a look, and move on way more than in the middle where they linger, and frequently buy, in my booth. On the flip side, I also got to see the already laden crowds not even stop to look as they made there way past my booth and on to their cars. Very disconcerting. I guess your metaphor of working the fringes fits here. Although there was great traffic at the show (25-30,000 was the guess for 2 days), being the first or last part of the show turned a great opportunity into a break even affair for me.
This particular promoter has three other shows that i will be in. I have asked to be located in the middle areas again, and hopefully that will lessen a repeat. And, boy, do I relate to those on the fringes.
When I was beginning this fun trek I would have been amazed to use the low amounts in the chart. Now my bride will make me hammer things that weigh more than she thinks I am capable of, but maybe she hasn't seen this chart.