It would also be interesting to see what would happen using the crystals grown in one solution as seeds in a chemically different solution. The right sequence m

It would also be interesting to see what would happen using the crystals grown in one solution as seeds in a chemically different solution. The right sequence might not be reactive, but you could layer them ... Ooh, epitaxial growth! Could try that with a series of alums - Al(iii), Cr(iii) and Fe(iii) is all readily available.