I'm really into safely making/experimenting with my excess metals from my periodic table of the elements collection. I decided I had enough Vanadium so I wanted to test against the acids (HCl, H2SO4, HNO3) so I set up 3 tests tubes and the only one that reacted with with nitric acid.
The solution was a blue color, into a darker blue with sludge on the top. Once the powder was completely dry I thought maybe I have vanadium nitrate. The powder was insoluble in water and made sort of an orange stain wherever it touches