"black solution of boron" is a bit ubiquitous. But there are enough forms of boron readily available on the market that several "likely candidate" test batches could be produced easily. And your oven will go to 1000C, just not your conventional oven. Your microwave oven will hit 1000C and beyond, you'll just need to tape off the air vent and use a refractory of some sort. I've use silicon carbide and ceramic weave to melt copper in my microwave. It's melting point is just north of 1000C. So cheap walmart T's + boron + a freecycle microwave and you could be on your way to a kickass new startup. Let me know when you start the seed round.