Its tricky to layer a rainbow since it is hard to get
the colours in right order. If you start with the purple
you would probabaly have kahlua and parfait dŽamore in the
bottom two layers and work you way up. Tricky part is to
find something red that is light enough to form the top layer.
If you start with red you would probably go from grenadine
and up, but getting the same problem with finding a purple
top layer.
A drink with many layers that actually work is:
______________
Brandy \____________/
Green Chartreuse \__________/
Yellow Chartreuse \________/
DOM [______]
Maraschino [______]
Parfait DŽamore [______]
Kahlua [______]
The colours are not right for a rainbow, but it still makes
an impressive drink.