Vanadium Chemistry (2): From +4 To +3 and +2

 An electrolysis cell is a container with two electrodes in it. In order to be effective we need partitioning: carefully hit a test tube at ground to remove its bottom, and add glass wool in it. Here we do reduction so anode is inside, cathode is outside.

V2+ is very reducing so use paraffin liquid above solution.

In a short period, about a few days, you get purple solution which is the end.

Heat this solution with excessive ammonium sulfate and magnesium sulfate (V:(NH4)2:Mg=1:5:4)then cool, then you get purple crystals.

Similar procedure however, can't dye alums due to unknown reasons. Probably, different ion radius or wrong temperature? (Cooling also failed and solution freezing is driving me mad)

to be continued...