DIY antique mercury glass: For my sister's wedding I did the same thing to about 20 huge vases. The problem with that was trying to not have drips (of the vinegar water or the paint) when it wasn't a flat surface. I also found about halfway through that dripping the water on was much better than the spray bottle, and wiping after the paint had dried created the look I had wanted from the beginning. I never thought to spray the back black though, that's really smart.
ANTIQUE GLASS: DRINK SETS, DECANTERS, GLASSES & RELATED BARWARE. c.1900-1920 GREEN MOSER FLORAL ENAMELLED & GILT JUICE WATER GLASS. To visit my website click here: http://www.richardhoppe.co.uk or for help or information email us here: firstname.lastname@example.org