Colleagues, Friends - thank you for kind words. The spray effect isn't as effective as I'd like - but for a first attempt, I think it shows some promise. The photos show what I was doing.
As you saw in the earlier photos, the foil rests on the plane of the base, with the tinted water effects buiilt up around it. The cut piece of acetate, warped a bit over a candle flame, was hazarded across the trailing edge.
Test fit
And a roll of 'cotton' gauze glued to the leading edge. I raked water effects across the top and bottom of the acteate, but I'm afraid
my photoraphy skill aren't up to capturing the effect.
And you can view the finished product in the 'Completed' Thread.